All Tools

Estimate 0–60 mph acceleration, quarter mile elapsed time, trap speed, and power-to-weight ratio from horsepower and curb weight. Supports hp, kW, PS, pounds, kilograms, drivetrain loss, and launch grip.

Work out how much 2-stroke oil to add to your gas at any ratio (16:1 to 100:1 or custom). Enter litres or US gallons, get oil in millilitres and fluid ounces, compare every common ratio, or check a mix you already made.

Enter 4 numbers to solve the 24 game with +, -, *, /. Generate random practice cards by level and train mental arithmetic with instant answer checks.

Solve balanced three-phase systems for real power (kW), apparent power (kVA), reactive power (kVAR), line current or line voltage. Includes a power triangle, a Wye vs Delta table, and suggested wire gauge and breaker size.

Calculate frequency, period, and duty cycle for 555 timer circuits in astable and monostable modes. Enter R1, R2, and C values to get instant results with waveform visualization and step-by-step formulas.

Enter speed change, force and mass, or circular motion values to calculate acceleration. Get step-by-step solutions, g-force, and a velocity-time graph.

Calculate land acreage from dimensions in feet, meters, or yards. Supports rectangular, triangular, and circular shapes with step-by-step calculations, visual diagrams, and comprehensive unit conversions.

Convert acres to hectares instantly with step-by-step formula, visual area comparisons, bidirectional conversion, and a comprehensive reference table. Supports international number formats.

Convert acres to perches instantly with interactive visual land area comparison, bidirectional conversion, step-by-step calculations, and historical unit context for surveyors and property owners.

Convert acres to square feet instantly with visual land area comparison, common property size examples, step-by-step calculation, and comprehensive area conversion reference.

Convert acres to square meters instantly with visual land size comparisons, bidirectional conversion, common presets, and step-by-step formula breakdown.

Convert acres to square miles instantly with visual comparisons, step-by-step calculations, and a comprehensive conversion table for land area measurements.

Convert acres to square yards instantly. Features bidirectional conversion, step-by-step formula, common conversion table, real-world area comparisons, and multi-unit cross-reference.

Enter your section scores from 1 to 36 to calculate your rounded ACT composite score using current enhanced or historical rules. Scores cannot exceed 36.

Upload an image up to 25 MB to add a solid, gradient, or Polaroid-style frame with custom per-side width, then download as PNG or JPG.

Upload an image up to 25 MB to adjust shadow angle, blur, spread, and opacity, or generate subject shadows for transparent PNGs with CSS.

Draw a line on an image and set its colour, thickness, and style, then undo or download a PNG. The image stays on your device.

Easily add new audio to your video (mixing with original sound) or completely replace the video's existing audio. Keeps original video length. Option to loop shorter audio. Adjust added audio volume in dB.

Add page numbers to a PDF and save the result. Place them with a 3x3 position picker, choose the format (1, Page 1, 1 of 10), numeral style, start number, font size, colour and margin, and number a range or skip the cover.

Add one or more text layers, choose font and color, apply shadow, outline, glow, or 3D, and drag each layer into place.

Easily add a text or image watermark to your videos online. Customize position, size, font, and color. No uploads required.

Easily change video playback speed (slow motion or fast forward) online. Supports 0.25x to 4.0x speed adjustment. Free, client-side processing.

Analyze relationship compatibility by comparing Sun (identity), Moon (emotions), Venus (love style), and Mars (drive) signs. Get detailed pair-by-pair analysis, element harmony insights, and an overall compatibility score.

Calculate your exact age in years, months, weeks, days, hours, minutes, and seconds with interactive visualization, birthday countdown, life milestones tracker, and personalized insights.

Enter your dream description, waking feeling, and interpretive lens to receive a symbol map, emotion breakdown chart, and reflective questions.

Enter who the gift is for, the occasion, a budget, and their interests to get ideas with a reason, a price, and a shopping link.

Enter ingredients you have and pick a meal, cuisine, and diet to get two recipes with times, servings, and substitutions.

Build a day-by-day trip plan for any destination. Pick your city, number of days, pace, budget and interests to get morning, afternoon and evening activities, where to eat, local tips and a map link for every stop.

Type a question like 5 miles in km, how many tablespoons in a cup, or 70 mph to m/s and get the answer, the formula, a ladder of related units and a real-world comparison. Length, mass, volume, temperature, speed and more.

Calculate the exact BTU cooling capacity needed for your room based on dimensions, ceiling height, sun exposure, occupancy, and other factors. Get AC unit size recommendations.

Convert conventional oven directions into air fryer settings with food-specific temperature drops, shorter times, preheat guidance and turning reminders for frozen foods, vegetables, chicken, fish, baked goods and leftovers.

Enter floor area, ceiling height, and a cleanliness target to get the required CADR and the air changes per hour.

Convert amps to watts for DC, AC single-phase and AC three-phase circuits. Enter current, voltage and power factor to get real power in watts plus apparent power (VA) and reactive power (VAR) on an animated power triangle.

Enter a recurring number to explore its meaning, or calculate a number from your birth date. See the numerology method and each calculation step.

Convert angles between degrees, radians, gradians, turns, arcminutes, arcseconds, and milliradians instantly with a visual protractor diagram and DMS notation support.

Convert angular velocity between RPM, rad/s, deg/s, Hz, rev/s and rotation period, or work it out from linear speed and radius. Also gives tangential speed and centripetal acceleration at any radius, with a spinning-disk animation.

Enter a frequency and a velocity factor to get length in metres and feet for dipoles, verticals, ground planes, and loops.

The 1–5 estimate uses assumed cutoffs, not a verified official annual curve. It is not a guaranteed score or college credit. Each row shows one component improved on its own; — means that component alone cannot reach the assumed target.

Calculate the daily, monthly, and annual electricity cost of any household appliance from wattage, daily hours of use, local electricity rate, quantity, and optional standby power.

Find the right aquarium heater wattage from your water volume and the gap between target water and room temperature, then snap it to a real purchasable size. Supports gallons and litres, Celsius and Fahrenheit, with a tank diagram.

Work out how much substrate - gravel, sand or aqua soil - your aquarium needs from the tank dimensions and the depth you want. Includes a live 3D tank preview, several substrate types and weights in pounds and kilograms.

Calculate accurate aquarium water volume for rectangular, cylindrical, bow front, hexagonal, and corner tanks. Get fish stocking recommendations using inch-per-gallon and surface area methods with animated 3D tank visualization.

Enter driveway or road dimensions, thickness, and mix density to calculate asphalt tonnage, cubic yards, required truckloads, and total material cost.

Analyze the balance of the four elements (Fire, Earth, Air, Water) in your birth chart based on planetary placements to understand your fundamental temperament and energetic blueprint.

Enter birth date, time, and city to see how Cardinal, Fixed, and Mutable placements are distributed.

Convert astronomical distances between AU, light-years, parsecs, kilometers, miles, and light-time units. Includes light-travel time, cosmic scale visualization, and real-world distance comparisons (Earth-Moon to Andromeda).

Encode and decode text with the ancient Atbash mirror cipher (A↔Z, B↔Y, C↔X, …). Includes a live mirror visualization, full pair table, biblical Hebrew Atbash variant, digit-mirror mode, and round-trip self-inverse proof.

Enter classes attended and classes held to get your percentage and how many more to attend, or skip, to reach a target.

Extract audio tracks from your video files online. Select output format (MP3, WAV, AAC, OGG). Client-side processing.

Professional audio splitter tool to split and cut audio files online. Supports MP3, WAV, M4A, FLAC, OGG, AAC, WMA and other formats. 100% free, client-side processing ensures privacy. No upload required.

Generate baby name ideas by gender, cultural origin, style and starting letter, each with its meaning and roots. Flip a card to see origin and syllables, check how a name flows with your surname, and save favourites to a shortlist.

Enter days, people, and a calorie target to estimate food weight, a buffer, the meal split, and how pack weight falls each day.

Calculate and scale bread recipes using baker's percentages. Convert ingredient weights relative to flour weight, adjust hydration levels, and create perfectly proportioned dough every time. Essential for bakers and bread makers.

Convert recipe ingredient amounts when changing baking pan sizes. Easily switch between round, square, rectangular, and specialty pans with automatic area calculations and ingredient scaling.

Calculate even baluster spacing for a deck, stair or porch railing so every gap stays under the 4-inch code limit. Get the baluster count, even gap, on-centre spacing and a tape-measure layout list in imperial or metric units.

Convert any radiation exposure into Banana Equivalent Dose (BED). Find out how many bananas equal a dental X-ray, CT scan, or airline flight — free online calculator with comparison chart.

Enter keywords or pick a music genre to generate original band names complete with brandability scores and social handle availability previews.

Convert bar to psi (pounds per square inch) with a visual pressure gauge, common presets for tires and SCUBA, and multi-unit results.

Generate professional barcodes in multiple formats (CODE128, CODE39, EAN-13, UPC, ITF-14, MSI, Pharmacode) with customizable appearance. Download as SVG or PNG for free.

Decode Base64 encoded strings to plain text with detailed byte analysis, character breakdown, multiple output formats (text, hex, binary), URL-safe support, and encoding validation.

Encode text or files to Base64 with multiple encoding variants (Standard, URL-safe, MIME), real-time preview, encoding process visualization, and one-click copy. Supports UTF-8, ASCII, and binary data.

Work out how much baseboard, crown molding or trim a room needs. Subtract doorways, add a waste factor for miter cuts, and see the linear feet, the number of boards to buy, leftover offcut and total cost with a room blueprint.

Work out how long a battery lasts from its capacity (mAh, Ah or Wh) and the device's draw (mA, A or W). Includes an animated battery visual, efficiency adjustment and runtime breakdowns for phones, laptops and IoT devices.

Calculate exactly how much meat, buns, side dishes, condiments, drinks, and charcoal or propane you need for a BBQ based on guest count, appetite level, grill type, and event style. Get a complete shopping list with per-person breakdowns.

Convert decimal, binary or hex to BCD (Binary-Coded Decimal) and back, with step-by-step nibble breakdown, bit-by-bit visualization, and a BCD vs binary comparison.

Enter finished strand length, clasp size, and up to four bead types to calculate the exact bead count per color with a strand preview.

Estimate the maximum safe load, bending moment, shear, stress, and deflection of beams. Choose support type, load pattern, cross-section, and material to get a strength and serviceability verdict.

Calculate exactly how long your beer needs to chill in the fridge, freezer, or ice bath to reach the perfect drinking temperature. Uses Newton's Law of Cooling with support for cans, bottles, growlers, and different beer styles.

Fill in any three of absorbance, absorptivity, path length, and concentration. You also get percent transmittance and a calibration line.

Calculate the belt length that connects two pulleys from their diameters and centre distance. Supports open and crossed drives and gives the exact and textbook lengths, wrap angle on each pulley, speed ratio and driven RPM.

Solve the Bernoulli equation along a streamline for pressure, flow velocity or elevation at either point. Includes a step-by-step breakdown, an animated streamline diagram and an energy grade line chart, for water, air, oil and more.

Enter American, decimal, or fractional odds and a stake to see the payout, implied chance, and the vig if you enter both sides.

Convert binary to Gray code and Gray code back to binary, with a step-by-step XOR walkthrough, truth table, and bit-by-bit visualization.

Choose a 0.5-40 Hz beat, including Delta through Gamma, and optionally mix your MP3 or WAV with pink noise and fades. The WAV stays on your device.

Select your bird species and count to calculate minimum cage width, depth, height, recommended volume, and safe bar spacing.

Enter one date of birth and see your age in three systems: Western, Chinese xusui and Korean traditional age - with the next Lunar New Year and birthday milestones on one timeline, plus Chinese and Western zodiac signs.

Find the traditional birthstones and zodiac flowers associated with your birth month. Discover the unique symbolism, healing properties, and meanings behind these precious gems and blooms.

Calculate lumber volume in board feet with 25+ wood species, cost estimation, weight calculations, and 3D visualization. Perfect for woodworkers, contractors, and DIY enthusiasts.

Calculate the boiling point of water at different altitudes, elevations, or atmospheric pressures using the Clausius-Clapeyron equation. Includes step-by-step solutions and interactive altitude chart.

Enter molality and Kb, or pick a solvent, plus a van't Hoff factor. Get the boiling-point rise and new boiling point.

Calculate the recommended tightening torque, clamp-load preload, and yield-margin for a bolt — pick a metric M or imperial UN size, ISO/SAE grade, and lubrication, and compare both the short-form K-factor and the VDI 2230 detailed method.

Enter wall size, brick size, bond pattern, and door or window openings. Get brick count, mortar, and cost.

Calculate the precise amount of salt needed for pickling, brining, curing, or fermentation based on your desired salinity percentage. Supports multiple salt types with automatic density conversion.

Enter fluid density, object volume, and mass to determine whether an object floats or sinks, its buoyant force, apparent weight, and submerged percentage.

Convert butter into practical oil equivalents for cakes, muffins, brownies, pancakes and everyday baking. Enter sticks, cups, tablespoons, grams or ounces, pick an oil, and get kitchen-friendly amounts with texture and flavour notes.

Generate randomized Bingo cards filled with corporate buzzwords like Synergy, Deep Dive, and Circle Back. Perfect for your next meeting — mark off each buzzword as you hear it!

Enter container dimensions or volume, wax type, fragrance percentage, and candle count to calculate total wax weight and fragrance oil needed.

Calculate stored charge (Q=CV), energy (E=½CV²), and reactance (Xc=1/2πfC) for capacitors. Decode 3-digit ceramic capacitor codes instantly. Interactive animated diagram with step-by-step solutions.

Work out carpet square footage, estimate material and installation costs, plan the roll layout with seam placement and allow for waste. Supports rectangular, L-shaped and multi-room layouts with padding and a cost breakdown.

Enter your cat's weight, life stage, and activity level to calculate daily caloric requirements and get suggested portion amounts for wet and dry food.

Find out how many litter boxes your cats need using the vet-recommended one-per-cat-plus-one rule, adjusted for the floors in your home. Get a floor-by-floor placement plan, a scooping schedule and monthly litter cost.

Convert your cat's age to human years with accurate life stage analysis, health insights, and visual comparison charts.

Enter room length, width, and ceiling height. Get blade span, downrod length, mount type, and hanging height.

Convert Celsius to Fahrenheit with the exact formula F = C x 9/5 + 32. See the result on a dual-scale animated thermometer with real-world context, a step-by-step breakdown, Kelvin and Rankine equivalents and a reference chart.

Enter your birth date to identify your sacred Celtic tree sign, associated personality traits, and druidic zodiac symbolism.

Solve F = mv2/r for centripetal force, mass, radius or speed. Switch between linear speed (m/s, km/h, mph) and angular inputs (rad/s, RPM, period), and read the g-force, period, angular velocity and the tire grip a turn needs.

Convert CGPA to a percentage using the formula your university actually uses. See your grade under CBSE (x 9.5), simple x 10, VTU, Mumbai University and GTU side by side, plus the division or class it falls into.

Generate endless charades ideas by difficulty and category - movies, animals, actions, famous people, songs, jobs and more. Each word hides on a tap-to-reveal card, with a countdown timer ring and a two-team scoreboard.

Work out how much hard cheese, soft cheese, crackers, cured meat, fruit and accompaniments a cheese board needs from your guest count, occasion and appetite. Get a shopping list with per-person amounts and assembly tips.

Balance chemical reaction equations automatically by finding the correct stoichiometric coefficients for reactants and products. Enter any unbalanced equation and get the result with explanations and atom conservation checks.

See whether the ancient Chinese Gender Chart says boy or girl. Enter the mother's birth date and the conception or due date and the tool converts them to the traditional lunar age and month, then highlights the result on the chart.

Work out how much chocolate, oil and dipping food your chocolate fountain needs from the fountain size, guest count, chocolate type and event length. Get a shopping list covering strawberries, marshmallows, pretzels and more.

Estimate a dog's chocolate toxicity risk from body weight, chocolate type, amount eaten, time since ingestion and symptoms. Converts it to a methylxanthine dose in mg/kg, compares it with veterinary thresholds and explains the next step.

Calculate the exact length of lights, number of baubles, tinsel, and ribbon needed for your Christmas tree. Uses cone geometry based on tree height and base width to give you a precise shopping list so you never buy too much or too little.

Crop a photo to a circle or oval, add a ring, pick an avatar size, and preview it at 128, 64, and 32 pixels before downloading a transparent PNG.

Generate APA 7th, MLA 9th and Chicago 17th citations for books, journal articles, websites and newspapers. See the matching in-text citation and footnote, plus a colour-coded anatomy of each reference, and build a full bibliography.

Find out how many outfits a capsule wardrobe of tops, bottoms, dresses, layers and shoes can make. Shows a combination matrix, how many days you can go without repeating an outfit, and your outfits-per-item efficiency.

Convert clothing sizes between US, UK, EU, France, Italy, Japan, Korea, international alpha sizes, and body measurements. Includes women's clothing, men's tops and jackets, jeans waist sizes, visual size rails, and fit notes.

Convert a height in centimeters to feet and inches. See the calculation steps, a visual height comparison and a chart of common heights.

Instantly convert centimeters (cm) to inches with our free online converter. Includes conversion formula, visual ruler guide, and common conversions.

Convert CMYK (Cyan, Magenta, Yellow, Black) color values to Hex code with real-time preview, RGB breakdown, step-by-step conversion, color harmony suggestions, and multiple output formats for web and print design.

Enter each ingredient's volume and ABV, then an ice-melt allowance. Get the drink's final alcohol by volume.

Calculate the optimal coffee-to-water ratio for your preferred brewing method including Pour Over, Espresso, French Press, Cold Brew, AeroPress, Moka Pot, and Drip Coffee. Adjust strength from light to extra strong.

Create stunning photo collages online for free with 6 professional layouts, customizable gaps, background colors, drag-and-drop reordering, and high-resolution downloads. 100% private - all processing in your browser.

All-in-one color converter that takes any input color and instantly shows its equivalent values in HEX, RGB, HSL, HSV, and CMYK, with a live preview swatch, accessibility contrast check, and complementary palette.

Check color contrast ratios between text and background colors. Test WCAG 2.x AA/AAA compliance for normal and large text with real-time preview, color suggestions, and detailed accessibility analysis.

Invert colors instantly with our free online tool. Supports HEX, RGB, HSL, CMYK formats with live preview, color wheel visualization, accessibility contrast checker (WCAG), and complementary color generation.

Generate professional color schemes with complementary, analogous, triadic, split-complementary, square, and tetradic harmonies. Interactive color wheel, real-time preview, CSS/Tailwind export, and accessibility contrast checker.

Calculate the total days, months, and years of your life spent commuting to work. Enter your daily round-trip travel time and years worked to reveal the staggering total and explore what else you could do with that time.

Generate a genuine, ready-to-send compliment for anyone in your life. Pick the person and what to praise - character, effort, kindness, skill, style or a win - add a name, then watch the Warmth Meter and copy, save or share it.

Calculate the carbon-to-nitrogen (C:N) ratio of a compost pile from brown and green material proportions. Get a visual recipe, ideal 25:1 to 30:1 target guidance, and practical correction tips for fast, odor-free composting.

Compress PDF files and shrink their size right in your browser. Open one PDF or a batch of up to 30, pick a quality preset, see an estimated size first, then download each file or all as a ZIP. Tune DPI, image quality or grayscale.

Calculate concrete volume in cubic yards, meters, and feet for slabs, footings, columns, and stairs. Get pre-mix bag counts, ready-mix estimates, material costs, and professional tips for your project.

Enter wire sizes, insulation, and EMT, PVC, RMC, or IMC. Get fill percent and the smallest legal trade size.

Upload any image and instantly convert it into a numbered connect-the-dots puzzle. Adjust dot count, size, and numbering. Download or print your custom dot-to-dot activity sheet. Perfect for kids, teachers, and puzzle lovers.

Convert any video into a Twitter (X)-ready MP4 with H.264 video and AAC audio, an approved frame size, a 30 or 60 fps cap and the 2 minute 20 second length limit. Runs entirely in your browser with FFmpeg.wasm, so nothing is uploaded.

Convert between common cooking measurements including cups, grams, tablespoons, teaspoons, ounces, milliliters, and liters. Supports ingredient-specific density conversions for accurate baking and cooking results.

Create and print a Cornell notes template. Customise the cue column, note area and summary, choose ruled lines, dotted grid or blank paper, pick A4 or US Letter, add a title, name, date and class, then print or save as PDF.

Calculate corrected calcium level adjusted for albumin with multiple formulas (Payne, modified), clinical interpretation, visual calcium distribution diagram, and step-by-step calculation breakdown.

Enter measured sodium and glucose. Get hyperglycemia-corrected sodium from the Katz and Hillier formulas.

Enter your daily cigarette consumption and pack price to see daily, monthly, yearly, and lifetime smoking costs along with potential investment returns.

Find out whether your couch fits through a doorway before moving day. Checks the sofa upright and on its side, shows the clearance to spare, tells you if removing the legs rescues a tight fit, and compares the diagonals.

Compute the electrostatic force between two point charges with Coulomb's law. Solve for force, either charge or distance, choose charge units and a dielectric medium, and read direction, electric field and potential energy.

Convert crochet hook sizes between US letters and numbers, UK/Canada numbering and the metric mm scale. Pick a size in any system to see every equivalent, the recommended yarn weight and a steel thread-hook table.

Calculate crop factor, 35mm equivalent focal length, angle of view, field of view, and equivalent aperture for full frame, APS-C, Micro Four Thirds, medium format, cinema, and custom sensor sizes.

Enter stitch count, Aida count, strands and density to get thread length per stitch, total length and skeins to buy, including a waste buffer.

Enter pattern stitches, fabric type and count, stitch-over and a framing margin to get finished size in inches, centimetres and millimetres.

Generate custom crossword puzzles from your own words and clues. Arranges intersections for the best fit, numbers the Across and Down clues, and produces a puzzle you can solve online or print for classrooms and events.

Encrypt famous quotes or your own text with a substitution cipher, then solve the puzzle interactively with letter tracking, hints, animated reveals and difficulty levels. Good for brain training, lessons and word-puzzle fans.

Enter impressions and clicks to get the click-through rate, compare campaigns and see how many clicks a target rate would need.

Enter cubic feet or cubic yards to convert either way for mulch, gravel, soil, sand or concrete, then add a waste allowance and estimate weight and truck loads.

Enter a volume in cubic meters or cubic feet to convert between m³ and ft³, view shipping container fill estimates, and check freight presets.

Enter length, width and depth in feet, inches, yards or metres to get yards, tons, truck loads, bags and a waste buffer for concrete, gravel, mulch or soil.

Convert between US cups and gallons with a visual conversion chart, instant bidirectional calculator, step-by-step formula, and a full reference table for common cooking and baking measurements.

Convert volume to weight for specific cooking ingredients. Get accurate gram measurements for cups of flour, sugar, butter, and 50+ common baking and cooking ingredients with density-adjusted conversions.

Enter US cups or liters to convert either way, with a measuring-cup reference and common cooking equivalents.

Convert cups to ounces with support for US, Imperial, and Metric cup standards. Includes visual diagrams, quick reference tables, and ingredient weight conversions for cooking.

Convert between US cups and US quarts with a visual quart-fill diagram, bidirectional converter, step-by-step formula, multi-unit conversion panel, and a comprehensive cooking reference table.

Convert cups to tablespoons and tablespoons to cups instantly. Features bidirectional conversion, visual measuring guide, common recipe measurements, ingredient-specific conversions, and fractional results for easy cooking and baking.

Convert cups to teaspoons and teaspoons to cups instantly. Features bidirectional conversion, visual measuring guide, common recipe conversions, and fractional results for easy cooking.

Enter window measurements, fullness and where the hem should fall to get panel width, length, a ready-made size and sewing cut dimensions.

Generate a groan-worthy dad joke on demand. Pick a theme like Classic, Food, Animals or Tech, read the setup, then tap to drop the punchline. A Groan-o-Meter rates it, and the browser can even tell it in a dad voice.

Generate positive affirmations for your goal - self-love, confidence, success, calm, health, gratitude, focus or sleep. Each appears on a calming card with a guided Breathing Aura pacing a 4-count inhale and 6-count exhale.

Calculate how much time you can save per year by saving just a few minutes each day. Discover the cumulative impact of small daily time savings with detailed breakdowns and visual comparisons.

Convert internet & data transfer speeds between bps, Kbps, Mbps, Gbps, Tbps and their byte counterparts (KB/s, MB/s, GB/s). Includes download-time estimator, ISP tier badge, per-hour/day data totals, and clear bits-vs-bytes explanations.

Enter mass and velocity, or kinetic energy, to get the de Broglie wavelength from relativistic momentum and a wave-versus-classical comparison.

Calculate power and voltage gain or loss in decibels, convert between dB and linear scale, and analyze signal levels with dBm and dBW conversions.

Enter board, railing and stair sizes, stain type, wood surface and coats to get gallons, whole cans to buy, leftover and estimated cost.

Enter length, width, board size, gaps and spacing in imperial or metric units to list boards, joists, beams, posts and fasteners, with a waste allowance.

Find the right dehumidifier pint capacity for a room, basement or whole house. Describe the dampness in plain language and get a capacity on both the 2019 DOE scale and the old scale, with target humidity and daily water removal.

Open a PDF and remove pages by thumbnail or by ranges such as 2, 5-8, 11, or keep only listed pages, then download it. Blank pages can be flagged.

Enter mass and volume to get density, or density and one known value to get the missing mass or volume, with units, steps and material comparisons.

Calculate depth of field, hyperfocal distance, near and far focus limits and circle of confusion for any camera and lens. Includes an interactive visualization and a real-time aperture comparison for photographers.

Enter your birthday to calculate your numerology destiny number with step-by-step reduction, personality insights, and compatibility analysis.

Drop a screenshot into an iPhone, Android, iPad, MacBook, browser window or monitor frame. A crop meter shows exactly how much is cut off, and the PNG is drawn in your browser.

Select restrictions such as vegan, gluten-free, nut-free or keto together, and an optional meal type, to see which recipes satisfy them.

Enter any three of stock concentration, stock volume, final concentration and final volume to solve the missing one with M₁V₁ = M₂V₂.

Enter what needs washing and the machine size to sort each item into a rack zone, check spray-arm clearance and estimate cycles, water and energy.

Choose a length up to 100 characters, a character set and how many keys to generate Django SECRET_KEY values and see each key's entropy.

Estimate how much food a dog should eat per day from body weight, life stage, activity, feeding goal, meal frequency, treats and the label's energy density. Converts daily calories into cups, cans or grams and per-meal portions.

Enter breed, size, age, weight condition, activity and care to estimate likely lifespan and years remaining, instead of a generic breed average.

Enter a dog's age and size to convert dog years to human years with veterinary guidelines, and see the life stage.

Calculate the observed frequency, wavelength change and pitch shift when a source moves relative to an observer. Supports classical sound and relativistic light Doppler, several media, a live animation and an audio pitch preview.

Calculate dough hydration level (water-to-flour ratio) for perfect bread texture. Features visual dough consistency preview, baker's percentages, and full recipe generator for artisan bread, pizza, bagels, and more.

Generate drawing prompts that combine a subject, an art style and a mood. Pick a category and skill level, spin the three-reel idea slot machine, lock the reels you like, add a challenge constraint and use the gesture-drawing timer.

Calculate the number of drywall sheets needed for walls and ceilings, plus estimates for joint compound, tape, and screws. Supports imperial and metric units with multiple sheet sizes and customizable waste allowance.

Calculate the energy locked in any mass with E=mc2, or work backwards from energy. See joules, kilowatt-hours and tons of TNT translated into everyday comparisons, with efficiency presets for antimatter, fusion and fission.

Enter the number of questions and get a colour-coded chart showing the percentage and letter grade for every number of wrong answers. Drag the slider to grade a paper in a second, and switch between Standard, Plus/Minus and lenient scales.

Place up to six point charges and a test point to get field components, magnitude and direction, plus force on a probe charge and potential.

Calculate voltage, current, resistance, and power using Ohm's Law and Watt's Law. Enter any two known values and instantly solve for the other two with detailed step-by-step formulas.

Compare cost per kWh for coal, gas, nuclear, solar, wind and hydro from capital cost, fuel, capacity factor, life, operations, discount rate and carbon price.

Enter an element or ion to get full and noble-gas configurations, an orbital diagram, unpaired electrons and paramagnetic or diamagnetic character.

Enter both ratings, the match result and a K-factor to get the rating change and expected score, plus the change for a win, a draw and a loss.

Calculate the optimal email reply time based on sender status, urgency, and your relationship. Avoid looking too eager or too aloof with our playful timing algorithm that factors in workplace dynamics and social psychology.

Estimate how much embroidery floss you need by stitch type: satin fill, backstitch, stem, chain outlines and French knots. Get total length in metres and yards, the skeins to buy and how many working cuts to prepare.

Determine the empirical formula of a chemical compound from element mass percentages or experimental mass data. Optionally compute the molecular formula using molar mass.

Instantly convert between 12+ energy units including Joules, Calories, BTU, kWh, eV, and more. Features real-time conversion, practical examples, and scientific notation support.

Calculate static compression ratio from bore, stroke, chamber volume, head gasket, deck clearance and piston dome or dish. Shows displacement, a swept-versus-clearance breakdown and which fuel octane your ratio needs.

Enter bore, stroke and cylinder count to get displacement in cc, litres and cubic inches, per-cylinder volume, and oversquare, square or undersquare.

Work out how much epoxy resin river tables, deep pours, flood coats and round moulds need. Get mixed volume in gallons and litres, the resin-to-hardener split for any ratio, mixed weight, coverage area and an optional cost estimate.

Calculate the escape velocity of any planet, moon, star or custom body from its mass and radius. Pick Earth, the Moon, Mars, Jupiter, the Sun or a neutron star, and see km/s, mph and Mach on a ladder from a sprinter to light speed.

Enter battery size, current and target charge, and charger power, to get time and cost, range gained, and the 50%, 80% and target points.

Estimate the real-world range of any electric vehicle from battery capacity, efficiency, speed, temperature, climate use, terrain and driving mode. Visual battery gauge, factor breakdown and charging cost estimate.

Open a JPG, PNG, WebP, HEIC or TIFF photo to read camera, lens, exposure, GPS and time tags, map the coordinates, and download a copy without them.

Balance ISO, aperture (f-stop), and shutter speed with equivalent exposure settings. Change one exposure triangle value and see the matching settings that preserve the same EV.

Calculate your numerology expression number (also called the name number) based on your full name. See your letter-by-letter breakdown, reduction steps, and meaning.

Calculate the exact amount of fabric needed for sewing projects, quilting blocks, garments, and home decor. Features pattern layout visualization, waste minimization, directional print support, and detailed cutting diagrams.

Estimate Facebook and Instagram ad costs based on your budget, industry, campaign objective, and target audience. Calculate CPM, CPC, CPA, projected reach, clicks, and conversions with real industry benchmarks.

Free online tool to find any Facebook user, page, or group numeric ID from a profile URL or username. Essential for developers, marketers, and social media managers.

Convert Fahrenheit to Celsius with the exact formula C = (F - 32) x 5/9. See the result on a dual-scale animated thermometer with real-world context, a step-by-step breakdown, Kelvin and Rankine equivalents and a reference chart.

Work out how long it takes to fall through a tunnel drilled clean through the centre of the Earth. Explore the classic 42-minute gravity train with both uniform-density and realistic PREM models, and see the top speed at the core.

Pick a race, such as elf, dwarf, orc, dragon, human, halfling, fairy, or demon, and a gender for a name, pronunciation, epithet, and one-line backstory.

Enter feet and inches to convert that height to centimeters, and also see meters and total inches.

Instantly convert feet to meters with visual comparison scale, feet and inches input support, metric breakdown (centimeters/millimeters), and common length reference examples.

Calculate fence materials including posts, rails, pickets, panels, concrete, and hardware with visual diagrams. Supports privacy, picket, post & rail, and panel fence styles.

Enter a reference time and your room temperature to estimate how long a ferment takes with the Q10 rule, plus a ready-by time.

Calculate how much NPK fertilizer to apply from garden bed area, target nutrient rate, and the N-P-K percentages printed on the fertilizer bag. Shows exact product weight plus N, P2O5, and K2O delivered.

Enter a file size to convert it among bits, bytes, KB, MB, GB, TB, and PB using the 1024 standard or the 1000 standard.

Calculate the exact score you need on your final exam to achieve your target grade. Supports simple and weighted category modes with what-if scenario analysis.

Enter a stack's length, height, and depth to get full cords, face cords, and volume. Add the price for cost per cord and weight.

Schedule flashcard reviews with the SM-2 algorithm used by Anki and SuperMemo. Enter how well you recalled a card to get the new interval, ease factor, repetition count and exact next review date, plus a forgetting curve.

Enter two airports, cities, or coordinates to get the great-circle distance, bearing, and a flight time from cruising speed.

Flip animated GIFs horizontally (mirror) or vertically online for free. 100% privacy - files are processed in your browser, never uploaded to any server.

Flip images horizontally (mirror) or vertically online for free. 100% private - all processing happens in your browser. No upload required.

Easily flip your videos horizontally (mirror) or vertically online without uploading. Free, fast, and secure.

Enter room dimensions, unit coverage, waste allowance, and unit price to calculate required box or roll counts, total area, and material costs.

Calculate force, mass, or acceleration using Newton's second law F=ma. Enter any two values to solve for the third, with unit conversions and real-world force comparisons.

Crack open a virtual fortune cookie for a fortune, six lucky numbers and a Chinese word to learn. Tap the animated cookie to snap it, pick a theme like Wisdom, Love, Success or Luck, and get a lucky colour and lucky day too.

Change the frame rate (FPS) of your videos online - reduce or increase it - and download the result in seconds. Supports common presets and custom FPS. Free, fast, and fully client-side: no upload required.

Calculate the velocity, distance, and time for objects in free fall under gravity. Supports multiple planets and provides step-by-step solutions with trajectory data.

Calculate freezing point depression from molality and the cryoscopic constant. Includes a solvent library with real Kf data for water, benzene, cyclohexane and camphor, a van't Hoff factor for ionic solutes and an animated thermometer.

Convert fresh basil, parsley, thyme, rosemary, oregano, dill, mint, sage, tarragon and cilantro into practical dried amounts. Enter teaspoons, tablespoons, cups, grams or ounces and get a kitchen-ready equivalent with ratio notes.

Calculate static and kinetic friction force from the normal force or mass and the coefficient of friction. Add an applied push to see whether the object stays put or slides, its acceleration, and the angle of repose.

Enter your USDA hardiness zone and geographic region to calculate average first and last frost dates, growing season length, and safe planting windows.

Convert fuel economy between MPG, L/100km, km/L, and mi/L. Enter efficiency value, tank size, and fuel price to project tank range and CO2 output.

Generate Futoshiki inequality logic puzzles on grids from 4x4 to 9x9. Fill each row and column with unique numbers while respecting the greater-than and less-than signs, and solve with pencil marks, a timer, error checking and printing.

Convert US gallons to cups instantly with visual representations, bidirectional conversion, and complete volume breakdown including quarts and pints.

Convert gallons to litres. Because a US gallon (3.785411784 L) and an Imperial gallon (4.54609 L) differ, this converter shows both at once, with fuel-tank presets, an animated tank, a formula breakdown and a reference chart.

Generate brandable gamertags by style - tryhard, cute, cool, funny, fantasy, cyberpunk, retro or streamer. Each gets a Brandability score, platform-fit badges for Xbox, PSN, Steam, Twitch and Discord, and likelier-free variants.

Enter distance or odometer readings plus fuel used and fuel price to calculate MPG, L/100km, km/L, total trip cost, and CO2 emissions.

Compare the running cost of natural gas against electricity for heating, water heating, cooking or drying. Enter fuel prices and appliance efficiencies to see cost per useful kWh, the break-even price, savings and a CO2 comparison.

Calculate the gear ratio, output speed and output torque of a gear system from the teeth on the driving and driven gears. See an animated pair of gears turning at the real ratio, the simplified ratio and the mechanical advantage.

Pick appliances, or enter running and starting watts, to size a generator from total running watts plus the single largest surge.

Create stunning animated GIFs from your images with drag-and-drop simplicity. Adjust speed, quality, and dimensions. 100% browser-based for complete privacy.

Convert your animated GIFs into MP4 videos directly in your browser. Customize quality, size (dimensions/scale), preview, and download instantly. Fast, free, and private.

Find your glove size from hand circumference and hand length. Gives a letter size (XS-XXL) and numeric size (6-12), shows how to measure with an animated diagram, and covers men's, women's and unisex charts and fit preference.

Calculate exact golden hour and blue hour times for any location and date. Get optimal photography lighting windows with stunning visual timeline, sun position animations, and detailed shooting recommendations for photographers.

Enter course credits and letter grades to calculate GPA on the US 4.0 scale, including plus and minus grades and weighted GPA.

Calculate your overall course grade from individual assignments, exams, and projects with customizable weights and grading scales. Find out what score you need on remaining assessments to reach your target grade.

Professional CSS gradient generator with interactive color stops, angle control, preset gradients, and instant code export for CSS, Tailwind, and SVG.

Convert grams to ounces (oz) instantly with an interactive balance scale visualization, step-by-step calculations, common weight references, and a comprehensive conversion table.

Convert grams to pounds instantly with visual weight scale, real-world comparisons, bidirectional conversion, and interactive conversion tables for cooking, shipping, and everyday weight measurements.

Work out how much grass seed your lawn needs by area, grass type and whether you are starting fresh or overseeding. Get pounds of seed, bags, seeding rate, leftover and an optional cost, with a new-lawn versus overseeding comparison.

Plan a landscape job fast: pick rectangle, circle, triangle or ring beds, set the depth, choose gravel, sand, topsoil, mulch, compost or fill dirt, and get volume, weight, bags, truck loads and cost with compaction and waste factored in.

Calculate the gravitational force between two masses with Newton's law. Solve for either mass or the distance, choose units from grams to solar masses, and load scenarios like the Earth and Moon, with an inverse-square force curve.

Generate random 128-bit GUID/UUID identifiers (v1, v4, v5) compliant with RFC 4122. Features visual structure breakdown, multiple formats, batch generation, and UUID validation.

Enter the color-to-developer ratio and a total, the color you have, or your hair length to get each amount and how many tubes to buy.

Calculate how many hamsters running on exercise wheels would be needed to power your house, charge a Tesla, run a gaming PC, or operate any appliance. Based on real hamster exercise data.

Generate hangman words by length and topic - animals, food, countries, sports, science, movies and more - then play. An animated gallows draws limb by limb as you guess on an A-Z keyboard, with a Host mode for pass-and-play.

Generate Hashi (Hashiwokakero) bridge puzzles at four difficulty levels. Connect islands with single or double bridges so each island's number matches its bridges and all islands form one network. Includes a timer and solution checking.

Convert head circumference into US, UK, EU and S-M-L hat sizes. Enter a measurement in centimetres or inches, or start from a size you know, and get a full cross-system conversion with a tape-measure diagram and a complete size chart.

Enter mounting height, downward aim angle, and driving speed to calculate the headlight beam reach, lit zone, and safe stopping distance.

Calculate building heat loss through walls, windows, doors, and roof surfaces from R-value or U-value, area, and indoor/outdoor temperature difference. See BTU/hr, watts, surface shares, and the largest envelope heat-loss path.

Enter material dimensions, temperatures, and thermal properties to calculate conduction, convection, or radiation rates in watts and heat flux.

Convert hectares to acres instantly with visual size comparisons, real-world examples like football fields and farms, plus comprehensive unit conversions including square meters and square feet.

Convert HEIC/HEIF images to JPG format instantly in your browser. Batch conversion, adjustable quality, file size comparison, and image preview. 100% free, private, and no upload required.

Convert HEIC/HEIF images to PNG format instantly. 100% client-side processing ensures your photos never leave your device. Supports batch conversion with ZIP download.

Calculate how many standard helium balloons are needed to lift a person, object, or even a house (Up style!) using Archimedes' buoyancy principle. Includes fun presets, balloon type options, and altitude effects.

Calculate buffer pH from pKa and the conjugate base to weak acid ratio. Works three ways: find the pH, find the ratio and recipe needed to hit a target pH, or back-calculate pKa from a measured pH, with a buffer-capacity gauge.

Convert HEX color codes to CMYK (Cyan, Magenta, Yellow, Key/Black) values for print production with visual ink breakdown, step-by-step formulas, and print preview simulation.

Convert hexadecimal (hex) color codes to RGB, RGBA, HSL, HSLA, and CMYK values with real-time color preview, complementary colors, shades generator, and one-click copy functionality.

Estimate annual home energy consumption in kWh equivalent, heating and cooling load, energy cost, end-use breakdown, and the largest savings opportunities from home size, insulation, climate zone, HVAC equipment, and major appliance usage.

Calculate the alcohol by volume in homebrewed beer, wine, cider or mead from original and final gravity readings. Offers several formulas, Brix support, a fermentation animation, attenuation figures and a calorie estimate.

Enter body weight and activity to estimate daily hay as a share of weight, in pounds or kilograms, plus flakes, bales, and monthly cost.

Calculate engine horsepower from torque and RPM, or solve for any unknown. Supports Imperial (lb-ft, HP) and Metric (Nm, kW) units with step-by-step solutions and unit conversions.

Find out exactly how old you are in years, months, weeks, days, hours, minutes, and seconds. Get life milestones, birthday countdown, zodiac sign, and detailed age breakdown.

Find out how many ants it takes to weigh as much as you, and how much you could lift if you had the strength-to-weight ratio of an ant. Compare across 8 ant species with fun size comparisons and animated visualizations.

Enter room size, insulation, climate zone, sun, windows, occupancy, and appliances. See the BTU and tonnage to heat or cool the space.

Calculate the push and pull force a hydraulic cylinder produces from system pressure, bore diameter and rod diameter. See a cross-section, the piston and annulus areas, the extend/retract ratio, and results in N, kN, lbf and kgf.

Generate the right icebreaker question for team meetings, remote calls, classrooms, onboarding, workshops or all-hands. Pick your setting and warmth level, and let the Session Planner build a time-budgeted sequence for your group.

Calculate pressure, volume, moles, or temperature using the ideal gas law equation PV=nRT. Supports multiple unit systems with step-by-step solutions and automatic unit conversions.

Click the background to replace it with a color or gradient, or make it transparent. Tolerance, soft edges, and spill removal are included.

Protect privacy in your photos by censoring sensitive areas with pixelation, blur, or solid color. 100% client-side processing - your images never leave your device.

Upload any image and instantly pick colors with precision. Get HEX, RGB, HSL, and CMYK codes, extract color palettes, and discover color harmonies - all in one powerful tool.

Compress and resize images instantly in your browser. Supports JPEG, PNG, and WebP output with batch processing, visual comparison, and ZIP download. 100% private — files never leave your device.

Crop a photo to 1:1, 16:9, 4:5, or another preset ratio. Processing stays in the browser and the image is not uploaded.

Enhance images in your browser: adjust brightness, contrast, saturation, sharpness and temperature, or apply preset filters like Vivid, B&W, Vintage and Cinematic. Everything runs on your device, so your photos stay private.

Resize images online for free. Supports JPG, PNG, GIF, WebP. Batch processing, social media presets, aspect ratio lock. 100% private - images never leave your browser.

Rotate one or multiple images by any angle (0-360 degrees) with live preview, quick presets, and batch download. Free, fast, and works entirely in your browser.

Split a picture into rows and columns, adjust the guide lines and preview the pieces. Image processing takes place in your browser.

Convert any PNG, JPG, GIF, WebP or BMP image into ASCII text art in your browser. Choose from seven character ramps, adjust width, contrast and brightness, invert tones, preview side by side, then copy or download the result.

Trace any bitmap image into clean, scalable SVG vector paths in your browser. Choose the colour count, smoothing, edge detection and path simplification, preview alongside the original, then copy or download the SVG.

Extract text from clear, simple screenshots in your browser. Best for typed text with a plain background. Your images stay on your device. Review the text for errors.

Calculate the total impedance of RLC series and parallel circuits at any frequency. Get magnitude, phase angle, phasor diagram, resonant frequency, Q factor, and step-by-step breakdown.

Convert inches to centimeters instantly with interactive visual scale, fractional inch support, multiple output units (cm, mm, m), and real-world size comparisons.

Enter a decimal, a fraction, or a mixed number such as 3 1/2. See millimetres at 25.4 mm per inch, plus cm, metres, thou, and the nearest 1/16.

Enter mass, angle, and friction coefficients. See weight components, normal force, static and kinetic friction, acceleration, and whether it slides.

Enter land units such as bigha, katha, or marla and select a state to convert measurements into square feet, square meters, acres, and hectares.

Enter two of reactance, frequency, and inductance to solve XL = 2*pi*f*L. Add voltage to see RMS current and the 90-degree lag.

Enter campaign cost and engagement or conversion counts. See ROI, cost per engagement, earned media value, and a comparison across platforms.

Enter followers, likes, comments, and saves. See the engagement rate and how it compares with benchmarks for that account size.

Convert normal text into 25+ stylish Unicode fonts for Instagram bios, captions, and comments. Includes bold, italic, script, gothic, bubble, and decorative text styles that work on any platform.

Check any Instagram ID online: paste a username or profile URL to get the numeric user ID, full name, follower count and profile picture, or paste a numeric ID to find the username behind it. Free.

Calculate recommended R-values, insulation thickness, material quantity, and estimated costs based on your climate zone, building component, and insulation type.

Search by name, symbol, or number, or recolor all 118 elements by a property such as radius, density, or electronegativity, then open one element's data.

Create and download professional PDF invoices in seconds. Add your logo, unlimited line items, tax, discount and shipping, pick any currency, and export or print. A live preview updates as you type and drafts auto-save locally.

Convert IP addresses to binary with interactive visual breakdown, step-by-step explanation, and multiple output formats. Supports both IPv4 and IPv6 addresses.

Convert IP addresses (IPv4/IPv6) to hexadecimal with interactive visual breakdown, multiple output formats, step-by-step conversion explanation, and network analysis.

Calculate subnet masks, network addresses, broadcast addresses, and available host ranges from CIDR notation. Includes interactive binary visualization and address space mapping.

Instantly check if JavaScript is enabled in your browser and explore a full diagnostic of your browser's JavaScript capabilities, APIs, and features.

Find your dream job by searching millions of listings from thousands of job boards, company pages, and recruitment sites in one place.

Pick a theme, such as gratitude, work, or relationships, and a depth of light, deep, or profound for a prompt and a follow-up question.

Convert JPG and other images into a single PDF. Add multiple photos, drag them into order, pick a page size, orientation, margin and image fit, then download one combined PDF. A live preview shows how each image sits on the page.

Generate Julia set fractals from any complex parameter c. Pan and zoom a high-resolution canvas, pick c from a live Mandelbrot map, animate it along an orbit, trace the iteration path, and export a PNG or a shareable URL.

Paste an encoded JSON Web Token to view its header, payload claims, and expiry time without verifying signatures.

Generate signed JSON Web Tokens (JWT) with custom header, payload claims, and HMAC signing algorithms (HS256/HS384/HS512). Includes quick claim presets, expiry helper, live token preview, and a visual breakdown of the three JWT segments.

Calculate your K/D ratio, KDA and win rate from kills, deaths, assists, wins and losses. See your skill tier on a gauge, how many kills reach a target K/D, and use the what-if simulator to project your next few matches.

Generate Cross Sums (Kakuro) puzzles with adjustable size, difficulty, symmetry, and optional solution reveal for printing or practice.

Generate KenKen puzzles with valid cage targets, operation mix controls, and optional solution reveal for classroom practice or daily brain training.

Enter the semi-major axis and central mass, in AU, kilometres, or solar or Earth masses. See the orbital period and mean orbital velocity.

Estimate how many miles or kilometers your fingers have traveled across the keyboard based on your typing speed (WPM) and years of typing. Discover surprising distance equivalents and see your finger journey visualized.

Convert kilograms (kg) to pounds (lbs) with step-by-step calculations, weight breakdowns in ounces, and real-world weight comparisons.

Convert kilograms to stone and pounds the way body weight is said in the UK and Ireland. Get an exact stone-and-pounds breakdown, decimal stone, total pounds and grams, plus a weighing-scale dial and a reference chart. Works both ways.

Generate Killer Sudoku puzzles that combine classic Sudoku rules with Kakuro-style cage sums. Choose Easy to Expert, solve interactively with pencil marks and a timer, or print for offline play. Every puzzle has a unique solution.

Solve one-dimensional kinematics problems using the four kinematic equations. Enter any 3 known variables to find the 2 unknowns with detailed step-by-step solutions.

Enter any two of kinetic energy, mass, and velocity. Solve for the third in the units you choose, with steps and everyday energy comparisons.

Based on the viral internet meme: calculate how many slaps it takes to cook a raw chicken, or how fast a single slap must be. Uses real thermodynamics (Q = mcΔT) and kinetic energy (KE = ½mv²) to answer the ultimate physics question.

Convert kilometres to miles and back. Built for runners, with one-tap presets for 5K, 10K, half marathon, marathon and ultra distances, a dual-scale ruler showing both units at once, and automatic race recognition.

Convert knitting needle sizes across US, UK/Canada, Japanese and metric systems. Enter a size in any system to see every equivalent, a to-scale thickness diagram, the closest match where none is exact and a recommended yarn weight.

Enter gauge plus finished width and length. See cast-on stitches, total rows, and a yarn estimate for a sweater, scarf, blanket, or rectangle.

Search a use such as tarp, loop, or join. See outdoor knots with tying steps, a rope diagram, safety notes, and a comparison table.

Convert knots to miles per hour with the exact 1.15078 factor. See your speed on an animated Beaufort scale, get km/h, m/s and ft/s at the same time, and find the matching storm or hurricane category. Works both ways.

Convert kPa (kilopascals) to psi (pounds per square inch) instantly. Free online pressure unit converter with conversion formula, reference chart, and common pressure examples.

Convert between kVA, kW, amps and volts for DC, single-phase and three-phase systems. Enter any two values to get apparent, real and reactive power, current and voltage on a to-scale power triangle, with generator and UPS sizing tips.

Pick a Koch snowflake, Sierpinski, dragon curve, tree, or plant, or write an axiom, rules, and angle. Draw the result for up to eight iterations.

Pick a language, a CEFR level, and your study pace. See total hours from FSI categories, a completion date, and how that pace compares.

Find the right amount of laundry detergent for any wash. Tailors the dose to detergent type, load size, soil level, water hardness and machine, shows it on a measuring cap, and estimates the money you waste by overfilling.

Enter your lawn area, target nitrogen rate, and N-P-K fertilizer analysis to find the required product weight, bag coverage, and total nutrients applied.

Convert pounds (lbs) to kilograms (kg) with our easy-to-use weight conversion calculator. Get accurate conversions with visual representations and detailed explanations.

Estimate how long mastering a skill takes with learning curve theory. Enter the time your first attempt takes and a learning rate to project how each repetition cuts the effort, the total practice time and the reps to hit a target.

Calculate the correct current-limiting resistor for LED circuits. Supports single and series LEDs, finds nearest E24 standard resistor values, shows power dissipation, and includes an interactive animated circuit diagram.

Enter house size, wall thickness, and window and door counts, up to 3 floors. See how many 2x4 bricks a life-size house needs, plus weight and estimated cost.

Convert between length units instantly: meters, centimeters, millimeters, kilometers, feet, inches, yards, miles, and nautical miles. Features real-world comparisons and visual scale.

Solve the thin-lens equation to find focal length, object distance, image distance, magnification and image height. Tells you whether the image is real or virtual, upright or inverted, with a live ray diagram for both lens types.

Enter a birth date. See the life path number, the addition steps, and the numerology reading for that number.

Enter daily hours, bulb count, your rate per kWh, and wattage and price for each type. See energy cost, replacements, and a 10-year payback view.

Enter a balanced equation and each reactant in grams or moles. See which reactant runs out, the excess left, and the theoretical yield.

Convert liters to cups instantly. Supports US customary cups, metric cups (250 mL), and Imperial cups with precise calculations and a visual converter.

Convert litres to gallons, showing US and Imperial gallons at the same time. Includes fuel-tank presets, an animated liquid tank, a formula breakdown and a reference chart, and explains why the two gallons give different numbers.

Build and simulate digital logic circuits online with AND, OR, NOT, NAND, NOR, XOR and XNOR gates. Get instant truth tables, animated circuit diagrams, canonical Boolean forms and step-by-step evaluation.

Easily loop your videos a specified number of times. Processes in your browser, no uploads. Free and secure.

Set width and height up to 4000 pixels per side, plus colours, text, and style. Get a placeholder image and HTML, Markdown, or JSX you can paste.

Compare two birth dates using zodiac signs, elements and Life Path numbers. Names are optional. View the compatibility score and an explanation of each component.

Calculate board feet from lumber dimensions, estimate how many boards a project needs, and get the total cost with a waste factor. Supports standard and custom sizes, several wood species and templates for decks, fences and framing.

Enter bulb brightness in lumens or incandescent wattage to see power draw across LED, CFL, halogen, and incandescent bulbs plus estimated energy savings.

Enter a target lux and the room area or its dimensions. Get the lumens required, a figure that allows for light loss, and how many bulbs that is.

Analyze any MAC address to identify manufacturer, validate format, decode structure (OUI/NIC), determine unicast/multicast and UAA/LAA status with visual breakdown and comprehensive network details.

Generate random MAC addresses in multiple formats with prefix support, OUI lookup, unicast/multicast and local/universal options. Perfect for network testing, software development, and educational purposes.

Enter a full or partial MAC address, or a company name. Get matching manufacturers from the OUI list, up to 1,000 results.

Enter current and distance for a straight wire, a circular loop on axis, or a solenoid. Get the magnetic field, with an optional core on the solenoid.

Convert battery capacity between mAh and Wh using voltage, and check whether your power bank is allowed on a plane. Enter mAh and volts for watt-hours, the FAA and IATA 100 Wh and 160 Wh verdict, and usable mAh at 5 V USB.

Mark each currency LONG, SHORT, or NO ENTRY. Get orders for the 28 major pairs based on that strength selection.

Explore the Mandelbrot fractal interactively. Pan and zoom a high-resolution canvas, pick from eight palettes, raise the iteration depth for infinite detail, and hover any point to see its matching Julia set in real time.

Choose meat, fish, tofu, or vegetables, then enter thickness and how acidic the marinade is. Get a minimum, a target window, and a maximum time.

Calculate your Mars sign instantly with our accurate Mars Sign Calculator. Discover how Mars shapes your drive, passion, energy, assertiveness, and approach to conflict and desire.

Calculate your Life Path Number from your birth date and discover Master Numbers (11, 22, 33) with detailed spiritual meanings, calculation breakdown, and numerology insights.

Generate random, solvable mazes with custom dimensions, start/end points, and colors. Download as PNG, SVG, or animated GIF solution.

Convert mcg to mg and back, plus kg, g, ng and pg in the same view. Since 1 mg = 1000 mcg the decimal simply moves three places, shown as an animated shift strip and a metric prefix staircase, with exact decimal maths.

Estimate smoking time based on meat type, weight, and smoker temperature. Get recommended internal temperatures, resting times, wood pairings, and per-pound timing for brisket, pork shoulder, ribs, chicken, turkey, and more.

Calculate the mechanical advantage of a lever, pulley system, inclined plane or gear train. Get the ideal and efficiency-adjusted figures, the effort force needed to move a load, the distance trade-off and an animated diagram.

See the real-time cost of your meeting ticking up like a taximeter. Enter the number of attendees and average hourly rate, then start the timer to watch the cumulative cost grow second by second.

Calculate the maximum print size from a camera megapixel count, aspect ratio, and DPI. See pixel dimensions, quality grades for standard print sizes (4x6 to 24x36), and viewing-distance recommendations.

Check whether Mercury is retrograde now, or open a year from 1900 to 2100. See retrograde dates, shadow periods, and the zodiac sign, using Swiss Ephemeris.

Find your Mercury sign to reveal your communication style, thought processes, and learning approach. Enter your birth date, time, and location for an instant reading.

Merge PDF files into one document. Add several PDFs, drag the pages into any order, pick a page range from each file, and download a single combined PDF - all in your browser, with live thumbnail previews and drag-to-reorder.

Combine multiple video files into a single video online. Client-side merging, reorder videos before merging. Free and secure.

Instantly convert meters to feet with visual comparison scale, feet and inches breakdown, fractional inch display, and common length reference examples.

Enter milligrams or millilitres and a density, or pick water, milk, oil, honey, alcohol, or glycerin. Get the other measure, plus spoon and drop equivalents.

Calculate MPG (miles per gallon), convert to L/100km, estimate fuel costs, compare vehicle efficiency, and track CO2 emissions with our comprehensive fuel economy calculator.

Convert miles to kilometres and back. Built for drivers and travellers, with one-tap distance presets, a dual-scale road ruler showing both units at once, and automatic road-sign speed recognition from mph to km/h.

Calculate the precise miter and bevel angles for cutting trim, baseboard, crown molding, and picture frames at any corner angle. Includes interactive angle diagram, step-by-step formulas, saw setup instructions, and common reference angles.

Enter millilitres or ounces. Get US and UK fluid ounces side by side, with teaspoon, tablespoon, and cup equivalents either way.

Convert millimetres to inches as a decimal and as the nearest fraction (1/16, 1/32, 1/64). See where the measurement lands on an animated ruler, how much rounding error the fraction adds, plus cm, feet-and-inches and metres.

Calculate molality from moles of solute and mass of solvent, or from grams and molar mass. See the result on an animated beaker, then watch how molality drives freezing-point depression and boiling-point elevation on a temperature bar.

Calculate the molar mass of any chemical compound with detailed element breakdown, percentage composition, step-by-step calculations, and interactive periodic table.

Enter values to solve for molarity, solute mass, or solution volume. Or enter the initial and final molarity and volume for a dilution.

Enter a substance, molar mass, and input value to convert between moles, grams, and particles with full formulas and step-by-step solutions.

Select a shape, choose area or mass inertia, and enter dimensions to compute moments of inertia, parallel-axis offsets, and section modulus.

Calculate linear momentum (p=mv), analyze elastic and inelastic collisions with conservation of momentum, and compute impulse. Step-by-step solutions with collision animation.

Pick any past or future date. Get the phase, the percent lit, the Moon's age in days, and the next new, quarter, and full moons.

Discover your Moon Sign based on your exact birth time and location. Understand your emotional nature, inner self, and subconscious patterns through accurate astrological calculation.

Enter both people's birth date, time, and city. Get a Moon-sign reading of emotional style, nurturing, and how the two relate.

Decode Morse code to text instantly. Features visual Morse code chart, audio preview, and step-by-step decoding breakdown for easy learning.

Convert text to morse code with visual breakdown and audio playback. Learn International Morse Code with step-by-step character translation and sound generation.

Loop any section of an MP3 with a visual waveform, precise A and B markers, playback speed control and real-time preview. Set exact loop points, adjust tempo for practice and export as MP3, all processed in your own browser.

Upload an MP3 up to 10MB. Preview both waveforms and download the reversed audio, which is not stored.

Convert your MP4 videos into animated GIFs directly in your browser. Customize size, FPS, and preview instantly.

Enter a speed in mph or km/h to convert between units with an exact factor and view matching US or European speed-limit signs.

Enter area and depth for mulch, topsoil, gravel, or sand. Get volume in cubic yards or meters, weight, how many bags, and how many truck loads.

Tap along to the rhythm of any song to calculate beats per minute in real time, view beat intervals, and check tempo stability.

Paste a chord sheet or lyrics and choose your original and target keys to transpose chords, slash chords, and notes with sharps or flats.

Calculate your numerology name number based on your full name. Discover the meaning of your name number with detailed step-by-step calculation and interpretation.

Enter the standard potential, electrons transferred, temperature, and reaction quotient. Get the cell voltage, Gibbs free energy, and K.

Generate endless Never Have I Ever prompts by spice level, from family-friendly to wild. Slide the flame dial, filter by category, and play with a 10-finger tracker, an innocence score, a printable party list and a never-repeating deck.

Pick a year from 1900 to 2100. Get the date and time of every new moon and full moon, with the zodiac position of each.

Turn any real name into dozens of nicknames in cute, cool, funny, gamer, aesthetic and classic styles. Each one is built from the name you typed and shows the exact recipe used, plus a vibe meter and an overall catchiness score.

Upload an image and instantly create a Nonogram puzzle with row and column clues, answer key, and printable puzzle board.

Calculate the normality of a solution from equivalents and volume, or straight from grams using molar mass and n-factor. Converts between normality and molarity through the equivalence factor, with n-factor presets for common acids.

Enter a number up to 999 trillion and choose cardinal, ordinal, or currency. The result is that amount in English words.

Enter your birth date and full name to calculate Life Path, Expression, Soul Urge, Personality and Birthday numbers. See the calculations and numerology interpretations.

Blend two fuels to hit a target octane rating. Enter each fuel's octane plus a target to get the exact mix recipe, or two known volumes to check the octane you end up with. Uses volume-weighted blending with AKI, RON or MON.

Enter any two of voltage, current, resistance, and power. The other two are calculated, with the formula and the steps.

Work out the origami paper size you need for a finished model size. Pick a classic model - crane, masu box, lily, frog and more - or calibrate from your own test fold, then get the exact square to cut and the closest standard sizes.

π = iMRT; Osmolarity comparison (mOsm/L).

Convert ounces to grams instantly with visual weight scale, common conversions table, precision control, and step-by-step calculation breakdown.

Convert fluid ounces to cups and cups to ounces instantly. Features bidirectional conversion, visual measurement guide, common conversions reference table, and detailed step-by-step calculations for cooking and baking.

Enter ounces, including a fraction such as 1 1/2, or millilitres, up to 1,000,000. Get US 29.5735 mL, Imperial 28.4131 mL, and the 30 mL bar ounce.

Generate a personalized packing checklist by destination, weather, trip length, trip type, luggage style, and number of travelers. Includes carry-on essentials, weather gear, activity items, shared group gear, and pre-trip reminders.

Work out how much paint a room needs with smart coverage estimation. Covers walls, ceiling and trim with automatic door and window deductions, several coats, texture adjustments and a shopping list across different can sizes.

Pick a target colour and your base paints and get the mixing ratio and exact amounts to reach that shade. Solves the inverse colour-mixing problem with a least-squares optimizer, previews the blend and scores the match with Delta-E.

Create color schemes like complementary, triadic, and monochromatic, and export the palette to CSS, SCSS, JSON, or Tailwind.

Quickly compare A-series paper sizes, US Letter, Legal, Tabloid, and custom paper dimensions in mm, inches, points, pixels, aspect ratio, and printable area.

Enter 2 to 10 resistor values to get the equivalent resistance, how current splits, and how power is shared.

Enter building size or unit count and a use type to estimate parking spaces, including ADA and EV spots and land area.

Enter a password to see a strength score, its entropy, an estimated time to crack, and suggestions to improve it.

Calculate exactly how many pavers, how much bedding sand, joint sand, and gravel base material you need for your patio, walkway, or driveway. Supports multiple paver sizes and laying patterns with a printable shopping list.

Enter current, allowable temperature rise, copper weight, and layer type to calculate required PCB trace width, resistance, and voltage drop under IPC-2221.

Flatten form fields, comments, and annotations so they are no longer editable, either as vectors or as a raster image at a chosen DPI.

Select pages by thumbnail, a list such as 1, 4-6, 9, or a word search, reorder them, and download a new PDF.

Convert PDF pages into JPG or PNG images. See every page as a thumbnail, choose a resolution from screen quality up to 600 DPI, pick JPG or PNG with optional transparency, then download each image or all of them as a ZIP.

Extract selectable PDF text in reading order, including two-column pages, while dropping repeated headers and footers and rejoining hyphenated words.

Open one PDF and see how many pages, words, characters and sentences it contains, plus estimated reading and speaking time. A per-page chart and keyword-density list help you check an essay or manuscript against a length limit.

Enter length and gravity, or solve for period, length, frequency, or gravity, and compare the small-angle and elliptic results.

Calculate the terminal velocity and impact force of a penny dropped from any height. Debunk the famous Empire State Building penny myth with real physics — drag coefficients, air density, and energy comparisons.

Calculate the percent composition of any compound - the mass percent of every element. Enter a formula like H2O, C6H12O6 or CuSO4.5H2O for the molar mass, a per-element table and a comparison by mass versus by atom count.

Convert percent (%) to ppm (parts per million) with instant results, a visual scale diagram, and a common % to ppm reference table.

Enter actual yield and theoretical yield, or leave one unknown, to get the percent yield of a reaction.

Convert a percentage back into CGPA using the formula your university actually uses. Inverts every common rule side by side - CBSE, divide by 10, VTU, Mumbai University and GTU - and classifies the result into the standard division.

Convert perches to acres and acres to perches with visual area comparison, step-by-step calculation, and comprehensive conversion reference table for land measurement.

Enter a full name to calculate the numerology personality number from its consonants and read the interpretation.

Estimate whether pet insurance is likely to save money over your pet's remaining lifetime by comparing projected vet bills against premiums, deductibles, reimbursement rates and payout limits, for a young dog, indoor cat or senior pet.

Enter your pet's length, elbow height, shoulder width, and standing height to find the minimum IATA crate dimensions and matching standard series.

Calculate pH values from hydrogen ion concentration [H+], pOH, or scientific notation with interactive pH scale visualization and detailed step-by-step calculations.

Enter megapixels, bit depth, and quality to estimate JPEG, RAW, TIFF, HEIC, and PNG sizes and how many fit on a drive.

Calculate photon energy from a wavelength or frequency. Get the energy in joules and electronvolts, the matching frequency and wavelength, and the energy per mole, plus where the photon sits on the electromagnetic spectrum.

Generate a pickup line for any vibe - Cheesy, Funny, Smooth, Cute, Nerdy, Bold, Foodie or Sweet. Read the opener, then tap to deliver the closer. A Rizz-o-Meter rates it and a crush avatar fires back a playful comeback.

Generate Pictionary words and drawing prompts across four difficulty levels and filtered by category. Each word hides on a tap-to-reveal card, with a built-in sketch pad, a countdown timer ring and a difficulty-weighted scoreboard.

The calculated height is where the wire or D-ring rests on the hanger. Locate nail or screw holes using the actual hanger offset or mounting template.

Enter diameter, length, and flow or pressure to get flow rate, velocity, Reynolds number, head loss, and pressure drop.

Calculate exact flour, water, salt, yeast, and olive oil amounts for pizza dough. Choose from Neapolitan, New York, Detroit, or Thin Crust styles with adjustable hydration, fermentation time, and number of pies.

Calculate the perfect number of pizzas for your party based on guest count, appetite level, pizza size, and event type. Get detailed breakdowns with cost estimates, vegetarian splits, and per-person serving analysis.

Convert between Ka, pKa, Kb and pKb. Enter any one of the four acid-base equilibrium constants and get the other three, plus where the acid sits on a strength spectrum, how strong its conjugate base is and percent ionization at 0.1 M.

Calculate the optimal number of plants for any garden area using square grid or triangular spacing layouts. Visualize planting patterns, compare efficiency, and maximize your garden yield with interactive layout diagrams.

Turn any photo into a polaroid-style instant photo card with a handwritten caption. Choose real film formats (Polaroid 600, Go, Instax mini, square, wide), add vintage film looks, then watch it develop and download it.

Use average depth for water volume and a separate maximum depth for liner sizing. Add twice the maximum depth and twice the edge overlap to each plan dimension. Maximum depth must be at least the average depth. Liner estimate using maximum depth. Check the actual laid-out path over shelves and contours before buying.

Work out how much salt to add to a saltwater pool to hit a target salinity for your chlorine generator. Enter pool volume, current level and target ppm for the weight and number of bags - or how much water to drain if over-salted.

Calculate how much money you earn while using the bathroom at work. Enter your annual salary and daily bathroom minutes to find out your yearly poop pay, lifetime earnings, and fun equivalents.

Calculate how many popcorn kernels you need to completely fill a room. Enter room dimensions, choose kernel type, and see the total volume, weight, and cost of popcorn required with interactive 3D visualization.

Calculate gravitational potential energy (PE = mgh) or elastic potential energy (PE = ½kx²). Supports multiple planets, unit conversions, and detailed step-by-step solutions.

Account for clay shrinkage when sizing pottery. Calculate the fired size of a wet piece, work back from a target fired size, or measure your clay body's real shrinkage from a test tile, with earthenware, stoneware and porcelain presets.

Convert pounds to grams instantly with an interactive visual scale, common weight references, and detailed conversion tables. Features bidirectional conversion with real-world examples like food portions and everyday objects.

Instantly convert power between Watts, Kilowatts, Megawatts, Horsepower (mechanical & metric), BTU/h, Ton of Refrigeration, and Foot-Pound per Second with visual scale comparison.

Enter voltage, real power, and reactive or apparent power to calculate power factor, power triangle values, and required capacitor correction.

Convert ppm (parts-per-million) to percentage with visual scale, real-world examples, and detailed explanations.

Calculate pressure from force and area using P=F/A. Supports multiple unit systems (Pa, kPa, bar, atm, psi, mmHg) with step-by-step solutions, unit conversions, and real-world pressure comparisons.

Instantly convert pressure between Pascals (Pa), Kilopascals (kPa), Megapascals (MPa), Bar, Millibar (mbar), PSI, Atmospheres (atm), Torr, and kgf/cm² with visual gauge and quick presets.

Enter image pixel dimensions and target DPI to determine the maximum sharp print dimensions in inches and centimeters, plus standard print size ratings.

Calculate projectile range, maximum height, time of flight, and full trajectory from launch angle and initial velocity. Supports custom gravity, initial height, and animated trajectory visualization.

Set an open password and permissions for up to 30 PDF files at once to restrict printing, copying, or editing with AES-256 encryption.

Convert psi (pounds per square inch) to bar with a visual pressure gauge, common presets for tires, SCUBA, and industrial use, plus a multi-unit comparison table.

Convert psi (pounds per square inch) to kPa (kilopascals) instantly. Free online pressure unit converter with conversion formula, reference chart, and common pressure examples.

Calculate the mechanical advantage, effort force and rope pull distance of a pulley system from the number of supporting rope segments. Includes an animated block-and-tackle diagram and a real-world friction model.

Predict a puppy's likely adult weight range from breed profile, current age and current weight on a size-aware growth curve. See the adult size class, growth progress so far, remaining gain and when the puppy should finish filling out.

Enter a URL, text, WiFi login, email, or phone number to make a QR code, set colors and error correction, and download a PNG.

Enter liquid or dry quarts to calculate cups instantly across US, UK, and Metric measurement systems with step-by-step calculations.

Work out how much binding and fabric a quilt needs. Enter the quilt size, strip width and fabric width to get total binding length with corner allowance, strips to cut and yardage to buy, for straight-grain or bias, single or double fold.

Find thousands of quotes by author or phrase. Dive into a comprehensive quote database today!

Enter length, width, and depth to estimate soil volume, a settling allowance, bag count, and a soil-mix breakdown.

Generate random colors instantly with HEX, RGB, and HSL formats. Create color palettes, explore color harmonies, copy color codes with one click, and discover beautiful color combinations for your designs.

Generate a palette in one of six harmony modes, lock colors to keep, and export HEX, RGB, HSL, or CMYK.

Select a topic like Space, Animals, or History to discover surprising verified facts complete with surprise ratings and source links.

Generate random LONG or SHORT forex trading orders for 28 major currency pairs. Perfect for paper trading practice, strategy testing, and eliminating emotional bias in trading simulations.

Generate a clean joke, pun, dad joke or one-liner by style. Pick a category like Dad Jokes, Puns, Knock-Knock or Nerdy, read the setup, then tap to reveal the punchline with a drumroll and a groan-meter rating. All family-friendly.

Generate random thumbnails from uploaded videos.

Turn your real name or nickname into a rap stage name. Pick a style - trap, drill, old school, West Coast, conscious, melodic, grime or party - and the generator remixes it with classic hip-hop patterns, scored for flow and swagger.

Build a prey-model raw feeding plan from body weight and feeding percentage, split into muscle meat, edible bone, liver and other secreting organs. Compare classic 80/10/10 with custom ratios and get a weekly shopping list.

Calculate RC charging and discharging curves, time constants, and voltage at any given time for resistor-capacitor circuits. Get step-by-step formulas and a complete time constant table.

Calculate the number of rebar bars, total linear footage, weight and estimated cost for a concrete slab. Supports sizes #3 through #10 with presets for driveways, patios and foundations, plus a visual grid layout diagram.

Easily adjust ingredient quantities when scaling a recipe up or down. Enter your ingredients, set original and desired servings, and get perfectly proportioned amounts instantly.

Easily remove the audio track (mute) from your video files online. Keeps video quality. Client-side processing.

Drag page thumbnails into a new order and download the PDF. You can also reverse every page or fix a duplex scan.

Find the right UVB lamp output and basking distance for your reptile enclosure. Pick the species' Ferguson UV Zone and terrarium height, and the inverse-square law gives a basking distance that lands in the target UV Index range.

Choose a mould shape, enter a volume, or use a water weight, plus a mix ratio and waste margin. Get resin and hardener in ml, fl oz, and grams.

Calculate resistance values from color bands with an interactive visual resistor diagram. Supports 4-band, 5-band, and 6-band resistors with real-time updates, tolerance ranges, and detailed explanations.

Enter any number of series resistances and an optional supply voltage. Get total resistance, shared current, each voltage drop, and power.

Enter values for a series or parallel LC or RLC circuit. Solve for frequency, inductance, or capacitance, and get bandwidth and Q.

Calculate the number of blocks, gravel, drainage aggregate, geogrid, and total materials needed for your retaining wall project. Get a detailed material list with cost estimates.

Easily reverse short video clips online (best under 20s). Optionally select start/end times. Processed in your browser.

Enter velocity, length, density, and viscosity, and choose pipe, flat-plate, or open-channel flow. Get the Reynolds number and the flow regime.

Convert RGB to hex color code instantly with live preview, multi-format output (HSL, HSV, CMYK), CSS code snippets, color harmony palettes, WCAG contrast checker, and nearest named color matching.

Convert ring sizes instantly between US, UK, EU/ISO, Japan, China, plus diameter and circumference in millimeters. Includes a true-size visual ring, screen calibration, and a string-method measurement helper.

Free ROAS calculator to measure advertising efficiency. Calculate return on ad spend, compare multiple campaigns, find target revenue needed, and benchmark against industry averages.

Calculate roof pitch (slope), angle in degrees, and rafter length from rise and run or span. Interactive visual diagram, multiple calculation modes, and professional results for roofing, carpentry, and construction projects.

Calculate roofing materials for your project - shingles, metal sheets, tiles or underlayment. Includes a roof pitch calculator, waste factor adjustment, visual roof diagrams and material quantity estimates with worked steps.

Enter room dimensions, ceiling height, and room type to calculate required lumens, recommended bulb counts, and a scaled fixture layout.

Encode and decode ROT13 ciphertext instantly with a live alphabet wheel, character-by-character mapping, ROT5 for digits, ROT18 for letters and digits, and ROT47 for all printable ASCII characters.

Rotate PDF pages and save the result. See every page as a live thumbnail, then turn pages 90 degrees left or right - one page, all pages or a selection. A one-click Fix sideways button straightens every landscape page automatically.

Easily rotate your videos 90, 180, or 270 degrees clockwise or counter-clockwise online without uploading. Free, fast, and secure.

Round one corner or all of them, or switch to squircle, bevel, or scoop, then download a transparent PNG and copy the matching CSS.

Find the right rug size for a living room, dining room or bedroom using proven layout rules. Enter your room and furniture, and get an ideal size snapped to a rug you can actually buy, drawn on a to-scale top-down floor plan.

Estimate your scaled SAT score from raw section scores on the Digital SAT. Enter how many Reading & Writing and Math questions you got right for projected section scores, total, percentile and College Board readiness benchmarks.

Calculate the exact timing of your Saturn Return with precision ephemeris data. Discover your natal Saturn sign, all three return dates, and personalized life themes for this transformative astrological milestone.

Enter a measurement and a scale such as 1:72, 1:35, or 1:24, or type a custom ratio. Convert model size, real size, or another scale.

Turn a plain screenshot into a share-ready image: add gradient padding, rounded corners, a soft shadow and an optional window frame. The background can auto-match your screenshot, and everything renders in your browser.

Enter up to 12 capacitances in pF, nF, uF, mF, or F. Get the series or parallel total, charge or voltage split, and stored energy.

Instantly convert shoe sizes between US, UK, EU, Japan (Mondopoint), Mexico, Brazil, and Korea. Supports men's, women's, and children's sizes with foot measurement guide.

Calculate the exact water and energy cost of each shower based on duration, flow rate, water heater type, and local utility rates. Compare daily, monthly, and yearly costs with water-saving tips and habit change projections.

Predict how believable your sick day excuse will be based on day of week, weather, recent absence history, and excuse type. Get a satirical believability score, boss suspicion radar, and pro tips to improve your odds.

Estimate how much siding you need in squares from your exterior wall area minus windows and doors. Add gable ends, choose a siding type and waste factor, and get boxes or panels, total cost and a house elevation diagram.

Use recursion up to depth 9, or the chaos game up to 15,000 steps. Color the triangle by depth and export SVG or PNG.

Enter an EN, ISO, or brand temperature label. Get comfort, limit, and extreme readings, adjusted for a cold sleeper, pad R-value, and wet or windy weather.

Generate Slitherlink loop puzzles at four difficulty levels. Connect adjacent dots into a single closed loop guided by the number clues inside cells, with interactive solving, a timer, error checking and a solution reveal.

Enter rise, run, angle, or slope percentage to calculate grade and missing dimensions, evaluate steepness, and verify ADA wheelchair ramp compliance.

Pick beef, pork, poultry, fish, lamb, game, or vegetables for ranked woods with pairing strength and smoke intensity, or pick a wood to see what it suits.

Enter two refractive indices and an angle, or pick materials, to find the refraction angle, a missing index, the critical angle, or Brewster's angle.

Calculate the precise amount of lye (NaOH or KOH) for soap making using accurate saponification values for 40+ oils. Includes superfat calculation, water ratios, dual lye support and safety guidance for cold and hot process soap.

Search image and video sizes for Instagram, Facebook, X, YouTube, TikTok, LinkedIn, and Pinterest profiles, posts, stories, reels, and ads.

Find the best times to post on Instagram, Twitter/X, Facebook, TikTok, LinkedIn, and YouTube. Get personalized posting schedules based on your audience timezone with visual heatmaps and golden hour recommendations for maximum engagement.

Calculate the return on investment for social media marketing campaigns. Input ad spend, revenue generated, engagement metrics, and conversion rates to measure campaign effectiveness with visual performance analysis.

Free online tool to check if a username is available across 15+ social media platforms instantly. Find and claim your unique handle on Instagram, X/Twitter, TikTok, YouTube, GitHub, and more.

Calculate how much sod your lawn needs in slabs, rolls or pallets. Enter the lawn as a rectangle, circle, triangle or L-shape, add a waste allowance for cuts and edges, and get a to-scale diagram and an optional cost estimate.

Estimate solar panel energy output, roof-limited system size, required kW, panel count, annual kWh generation, and long-term electricity bill savings from sunlight hours, roof area, panel wattage, and local electricity rates.

Calculate residential solar payback period, ROI, and lifetime net savings from system cost, federal and state incentives, annual production, panel degradation, electricity rate inflation, and maintenance assumptions.

Calculate your numerology Soul Urge (Heart's Desire) Number from the vowels in your full name, with step-by-step breakdown and meaning.

Set loaf size, hydration, starter percentage, and salt to calculate your recipe ingredient weights, starter feeding schedule, and bulk-fermentation timing.

Pick a water-bath temperature and holding-time window from the protein cut, thickness, fresh or frozen start and desired doneness. Covers steak, pork, chicken, salmon and turkey, with texture, finishing and food-safety notes.

Enter servings, portion size, and a pasta shape to get the dry-bundle diameter and an on-screen circle to hold the bundle against. Maximum 50 servings.

Enter three of heat, mass, specific heat, and temperature change, or pick a substance, to solve Q = mcΔT for the missing one.

Instantly convert speed between Meters per Second, Kilometers per Hour, Miles per Hour, Feet per Second, Knots, Mach Number, and Speed of Light with interactive speedometer visualization and real-time comparisons.

Calculate the speed of sound in air from temperature with an optional humidity correction, or look it up in water, steel, helium and dozens of other media. Get m/s, km/h, mph, ft/s and knots plus Mach 1 and lightning-to-thunder distance.

A speedrun split timer with personal-best comparison. Build your run, time each segment to the millisecond, and see live ahead and behind deltas against your PB, gold segments, Sum of Best and possible time save. Works offline.

Out of a spice mid-recipe? Get the best substitutes for any missing spice, each with an exact swap amount scaled to your recipe, a flavour-match score and a visual comparison. Covers single swaps, blends and pantry availability.

Generate classic spirograph rosette patterns. Simulates the hypotrochoid and epitrochoid curves a pen traces as a small circle rolls inside or outside a larger one. Layer up to three pens, tune the radii, and export SVG or PNG.

Open a PDF, view page thumbnails, and split on custom ranges, into single pages, or every N pages. Download each part or one ZIP.

Enter force and displacement, or a hanging mass, for one spring or springs in series or parallel to get k, energy, period, and natural frequency.

Convert square feet to acres instantly with visual area comparison, real-world examples, and step-by-step conversion. Perfect for real estate, land surveys, and property calculations.

Enter square feet to get square metres, a to-scale blueprint, room dimensions for that area, plus square yards, acres, and hectares.

Calculate square footage for rectangles, triangles, circles, trapezoids, L-shapes, and custom multi-room layouts. Includes material estimator for paint, flooring, and tile, plus cost calculator and common room size references.

Convert square meters to acres with instant results, visual area comparison diagrams, real-world size references, and comprehensive conversion tables. Free online area converter with land size classification.

Enter square metres to get square feet, a to-scale floor plan, references such as parking spaces or a tennis court, plus acres and hectares.

Convert square miles to acres instantly with step-by-step calculations, visual scale comparison, real-world examples, and bidirectional conversion between square miles and acres.

Enter square yards or acres to convert either way, with a visual size comparison and the calculation steps.

Use the 3-4-5 rule (Pythagorean theorem) to verify if a corner is perfectly square (90 degrees) for foundations, framing, and layout work with instant accuracy feedback and visual diagrams.

Calculate stair dimensions including the number of steps, rise, run, stringer length and angle, and check compliance with IRC building code standards. Supports US Customary and metric units with automatic or manual step counts.

Enter your local cloud cover, humidity, Moon phase, and Bortle class to get a stargazing score, limiting magnitude, and night sky preview.

Estimate the weight of steel bars, plates, pipes, tubes and angles from their dimensions and density. Pick a shape, enter the sizes and choose a material to get per-piece and total weight, volume, surface area and cost.

Convert between moles, mass, and volume in chemical reactions using balanced equations, molar ratios, and molar masses. Get step-by-step stoichiometric solutions.

Enter stone and pounds, such as 11 st 4 lb, or a weight in kilograms, to convert either way. Up to about 650 kg or 102 stone.

Calculate a vehicle's total stopping distance from its speed, splitting reaction distance from braking distance, and see how dry, wet, snowy or icy roads change it. Includes a braking animation and driver-reaction presets.

Find the right self-storage unit size from a real inventory of your furniture, appliances and boxes. Tick what you need to store and how tightly you will pack, and see the recommended unit from 5x5 to 10x30 and how full it will be.

Enter wall length, 16 or 24 inch spacing, and any doors or windows to count studs, plates, and lumber, with an optional cost. Up to 500 ft.

Plan and track study sessions using the Pomodoro technique with customizable work/break intervals, visual countdown timer, and detailed session scheduling.

Generate unique 9x9 Sudoku puzzles from Easy to Evil, solve your own puzzles instantly, and print clean puzzle sheets to PDF for offline play.

Enter a date, time, and location to get solar azimuth and elevation, the day's sun path, sunrise, sunset, day length, and shadow length.

Enter your birth date, time, and city to calculate your Sun, Moon, and Rising signs and read how they relate.

Enter a location and date to get sunrise, sunset, solar noon, day length, each twilight phase, and the golden and blue hours.

Convert tablespoons to cups and cups to tablespoons instantly. Supports US, Metric, and Imperial measurements with visual fill-level diagrams.

Convert tablespoons to teaspoons and teaspoons to tablespoons with visual spoon diagrams, step-by-step calculations, and a quick reference table for common recipe measurements.

Calculate exactly how many tortillas, pounds of seasoned meat, cheese, salsa, guacamole, and toppings you need per person for a DIY taco bar. Get a complete shopping list with quantities for any group size.

Generate catchy team names for sports leagues, pub trivia, work groups, esports squads and fantasy football. Each gets a Squad Score with sub-meters for Intimidation, Wit and Morale, an auto-drawn monogram crest and a battle-cry verdict.

Convert teaspoons to cups and cups to teaspoons instantly. Features bi-directional conversion, visual measuring guides, common recipe presets, and a complete reference table for cooking and baking.

Convert teaspoons to tablespoons and vice versa with visual spoon representations, batch conversion for recipes, and a comprehensive quick reference chart. Supports US, metric, and UK measurement systems.

Calculate the probability of quantum reconstruction errors during teleportation based on your body mass, distance, and teleporter model. Find out if you'll arrive with extra body parts, reversed organs, or worse.

Convert temperature between Celsius (°C), Fahrenheit (°F), Kelvin (K), Rankine (°R), and Réaumur (°Ré) with visual thermometer display, reference points, and detailed conversion formulas.

Enter the tent floor dimensions and the undercut per side, in imperial or metric units, to get the footprint size, the DIY cut, and the area covered.

Calculate the terminal velocity of a falling object from its mass, drag coefficient and cross-sectional area. Pick a skydiver, raindrop, bowling ball or feather, choose air, water or honey, and see how far it must fall to reach it.

Generate gap-free Escher-style tessellations from regular and semi-regular tiles - triangles, squares, hexagons, rhombi, octagons and bricks. Colour them with curated palettes, curve the edges Escher-style, and export SVG or PNG.

Convert raw test scores to percentages, letter grades, and GPA equivalents. Supports customizable grading scales, batch score entry, and detailed performance analysis.

Convert text to binary, hexadecimal, and ASCII codes (or decode them back) with a live multi-format preview, per-character breakdown, separator and padding options, and full Unicode (UTF-8) support.

Enter a balanced equation, the product, and how much of each reactant you have to get the theoretical yield and see which reactant runs out first.

Calculate the change in length, area or volume caused by a temperature change. Pick a material or enter your own expansion coefficient, set the start and end temperature, and see the expansion, final size, strain and a diagram.

Estimate high and low tide times for any day from one known reference high tide. Projects the lunar tidal cycle forward and back, drawing a tide curve, a live tide clock and a daily table for semi-diurnal, diurnal and mixed patterns.

Free TikTok engagement rate calculator. Analyze video performance by measuring engagement from views, likes, comments, and shares with visual benchmarks and actionable insights.

Free TikTok money calculator to estimate creator earnings from the Creator Fund, brand deals, and live gifts. Enter your views, followers, and engagement rate to see potential monthly and yearly revenue by niche.

Calculate exactly how many tiles you need for floors or walls. Get complete material estimates including grout, adhesive, and cost calculations.

Work out how much grout a tiling job needs. Enter tile size, joint width and depth and the total area to get grout volume, weight in kilograms and pounds, bags to buy and coverage per square metre, for sanded, unsanded or epoxy grout.

Calculate relativistic time dilation, the Lorentz factor and length contraction at any velocity. Enter a speed as a fraction of light, km/s or mph to see how much slower a moving clock ticks and how far apart two travellers would age.

Paste a tire code such as 225/45R17 94V to see the maximum load per tire in kg and lb and the speed rating in km/h and mph.

Compare two tire sizes side by side with visual diagrams, speedometer correction, and detailed measurements including diameter, circumference, sidewall height, and revolutions per mile.

Enter current tread depth and a wear rate, or two depth readings some miles apart, to estimate miles left until the 2/32 inch legal minimum.

Enter titrant and analyte volumes and known concentrations to calculate the unknown molarity, equivalence-point pH, and recommended chemical indicator.

Compare toilet paper rolls by price, sheets, and ply count to find the true cost per sheet and cost per effective wipe. Add up to 5 products side-by-side to identify the best value.

Enter one gold weight in tola, tael, baht, troy ounces, or a related unit to see grams, the other units, and pure-gold content from 24K to 18K.

Calculate torque from force and lever arm distance using τ = F × r × sin(θ). Solve for any unknown variable with detailed step-by-step solutions, unit conversions, and real-world torque comparisons.

Convert torque between newton-metres, foot-pounds, inch-pounds, kilogram-force centimetres and metres, and dyne-centimetres. Includes real-world references for car wheels, bike pedals and fasteners plus a force-times-radius diagram.

Describe your goods or services and find the right Nice Classification trademark class from 1 to 45. Ranks the likely classes, highlights the keywords that matched, and reminds you when a business needs more than one class.

Enter your trailer's total weight and tongue weight to check against the safe 10-15% target range and receive cargo adjustment advice.

Calculate turns ratio, secondary voltage, primary and secondary current, and power for electrical transformers. Get step-by-step MathJax formulas for ideal and real transformer analysis.

Generate multiple-choice trivia questions by category and difficulty. Play an interactive quiz with instant scoring, a streak counter, answer explanations and a printable study mode, across eight categories at three difficulty levels.

Enter the turkey weight and a cooking method, including roasting, spatchcock, deep-frying, or smoking, for a cook time and timeline.

Enter screen size and seated eye level for floor-to-center, bottom, and top heights, a viewing-angle check, and a suggested downward tilt.

Enter viewing distance and resolution for a recommended screen size in inches, and whether 1080p, 4K, or 8K stays sharp at that seat.

Enter your streamer tier, viewer count, subscribers, and broadcast hours to estimate monthly Twitch revenue from subs, ads, bits, and donations.

Count characters for Twitter/X posts with real-time feedback. Shows remaining characters, detects URLs (counted as 23 chars), and handles emoji and CJK character counting accurately.

Convert a Twitter/X post URL or Tweet ID (Snowflake ID) to the exact date and time it was posted. Also converts dates to Snowflake IDs for advanced search filtering on Twitter/X.

Convert between frequency and wavelength across the electromagnetic spectrum with interactive visualization, step-by-step calculations, and support for custom propagation speeds.

Unlock a PDF you own by removing its owner password and the restrictions blocking printing, copying and editing. The tool x-rays the file first, showing the encryption used and which permissions are blocked, then returns a clean copy.

Decode URL-encoded (percent-encoded) strings with real-time preview, recursive multi-layer decoding, URL component breakdown, query parameter parsing, and encoding analysis. Supports UTF-8 and all percent-encoded characters.

Encode text for URLs with multiple encoding modes (RFC 3986, Query String, Form Data), visual character-by-character breakdown, and comprehensive encoding analysis. See exactly which characters get encoded and why.

Validate UUID strings, normalize GUID formats, and decode UUID v1, v4, and v5 metadata including timestamp, variant, node, random payload, and v5 namespace/name verification.

Enter human and vampire populations, feeding rates, and conversion rates to simulate a vampire outbreak using the Lotka-Volterra predator-prey model.

Determine whether your vehicle can safely tow a loaded trailer by checking GCWR, curb weight, passenger and cargo weight, trailer weight, tongue weight, optional GVWR, tow rating, and hitch tongue rating.

Calculate front and rear axle weight distribution. Enter the total weight with a balance, or the individual axle weights, to see axle loads, the percentage split, the longitudinal centre of gravity and the likely handling balance.

Calculate average or relative velocity from distance and time values, and convert instantly between m/s, km/h, mph, ft/s, and knots.

Enter your birth date, time and location to find your Venus sign. Read its astrological interpretation for affection, attraction and relationship style.

Calculate the optimal video bitrate for a target file size, duration, resolution, frame rate, codec, audio bitrate and quality level. Includes a bitrate budget breakdown, quality fit score, bits-per-pixel density and encoder settings.

Compress video files online directly in your browser. Reduce video size with adjustable quality settings. Free, secure, and no uploads required.

Crop your videos online directly in your browser. Draw a rectangle to select the area, preview, and download.

Split and trim a precise segment from a video in your browser. Preview the source, set start and end times, preserve compatible audio, and download an MP4 without uploading the file.

Extract single or multiple image frames from your videos online. Select time, interval, and format (PNG, JPG, WEBP).

Encrypt and decrypt text with the Vigenere polyalphabetic cipher using your own keyword. Includes a live key-alignment stream, a tabula recta visualization, the Autokey and Beaufort variants, round-trip proof and a Kasiski period hint.

Paste words and definitions to make a multiple-choice quiz, self-grading flashcards, or a printable worksheet with an answer key.

Calculate output voltage from a resistor divider network. Enter input voltage, R1, and R2 to find Vout instantly. Includes reverse calculation, interactive circuit diagram, step-by-step formulas, and power dissipation analysis.

Calculate voltage drop in electrical wires from the conductor material, AWG size, run length and load current. Essential for safe installations, NEC compliance and preventing power loss in residential, commercial and industrial wiring.

Convert volume instantly between Liters, Milliliters, Cubic Meters, US Gallons, Quarts, Pints, Cups, Fluid Ounces, Tablespoons, Teaspoons, Cubic Feet, and Cubic Inches with visual comparison.

Click or drag seed points, choose Euclidean, Manhattan, Chebyshev, or Minkowski distance, and export SVG or PNG. Lloyd relaxation is included.

Calculate how many wallpaper rolls you need for any room. Our calculator considers wall dimensions, pattern repeat, doors and windows, and waste allowance for accurate material estimates that help you save money and avoid running short.

Find the right water heater size for your household. Tank mode sizes it in gallons from peak-hour demand using the DOE first-hour-rating method, while tankless mode gives the GPM flow rate for your temperature rise plus BTU/hr and kW.

Estimate household water consumption in gallons or liters from people, shower and toilet fixtures, laundry, dishwasher loads, faucets, outdoor use, and daily usage habits.

Convert watts to amps for DC, AC single-phase and AC three-phase circuits. Enter power, voltage and power factor for the exact current, the formula used, a current-flow diagram and a suggested copper wire gauge and breaker size.

Use the wave equation to solve for wave speed, frequency or wavelength. Enter any two values with flexible units to get the third plus period, angular frequency and wavenumber, with a live traveling wave and spectrum band detection.

Estimate how many bottles of wine, beer, and spirits you need for a wedding or party. Customize guest count, event duration, drinking levels, and beverage mix to get accurate drink estimates with a visual shopping list.

Instantly convert weight between Kilograms, Grams, Milligrams, Pounds, Ounces, Stones, Metric Tons, Short Tons, Long Tons, Carats, and Micrograms with real-time updates and visual object comparisons.

Calculate your weighted grade by entering category weights and scores for homework, quizzes, exams, projects, and more. See weight distribution, letter grade, and step-by-step calculation breakdown.

Find out what your Chinese zodiac sign is based on your birth date. Discover your zodiac animal, personality traits, lucky numbers, compatible signs, and the meaning behind your Chinese astrological sign.

Shows this connection's public IP address, whether it is IPv4 or IPv6, and network details you can copy.

Find out what your lucky number is based on your date of birth using numerology. Discover the meaning of your lucky number with detailed interpretation and personality insights.

Enter your birth date for your zodiac sign, element, ruling planet, personality traits, and compatibility with other signs.

Enter wheel width, offset, and tire width to compare wheel setups and measure poke toward the fender, tuck, backspacing, and track-width change.

Find the right wine for your meal. Choose the dish type, main ingredient, cooking method and cuisine to get the best red, white, rose and sparkling matches, each scored with a reason, plus serving temperatures and grape suggestions.

Calculate wire diameter, cross-sectional area, resistance per length, ampacity ratings, and voltage drop for American Wire Gauge (AWG) sizes from 4/0 to 40 AWG. Supports copper and aluminum conductors with NEC ampacity tables.

Generate word ladder puzzles where you turn one word into another by changing a single letter at a time. Includes an interactive play mode, animated step-by-step solutions, difficulty levels and curated example puzzles.

Generate word scramble puzzles from any word list, with interactive letter-tile animations, difficulty levels, hints, a timer mode and printable worksheets - handy for teachers, vocabulary practice and ESL learning.

Create custom word search puzzles from your own word list. Choose a grid size from 8 to 25, difficulty (horizontal, vertical, diagonal, reverse) and colour theme, then solve by click-and-drag or print it with an answer key.

Convert words and phrases to phone numbers using the international standard T9 keypad letter mapping. Perfect for creating memorable phone numbers and understanding alphanumeric encoding.

Generate cryptographically secure WordPress security keys and salts for your wp-config.php file. One-click copy, key strength analysis, and step-by-step installation guide.

Calculate work done by a force (W = Fd cosθ) and mechanical power (P = W/t). Supports multiple units, angle input, and provides step-by-step solutions with energy comparisons.

Generate endless would-you-rather questions across funny, deep, superpower, food and family-friendly categories, then vote and see how the community split. Watch an animated tug-of-war, build a streak and write your own dilemmas.

Generate cryptographically secure WPA/WPA2/WPA3 keys for your wireless network. Create random, uncrackable WiFi passwords with customizable length, character sets, and security strength analysis.

Calculate how much yarn (yards/meters) you need for sweaters, blankets, scarves, and other knitting or crochet projects. Estimates based on yarn weight, gauge, project size, and stitch pattern.

Easily convert between fresh yeast, active dry yeast, and instant yeast with precise ratios. Perfect for bakers who need to substitute different yeast types in bread, pizza dough, and pastry recipes.

View real-time YouTube channel statistics including subscriber count, total views, video count, average views per video and the channel creation date, with Play Button milestone progress from the official YouTube Data API.

Free online tool to randomly pick comments from any YouTube video. Perfect for giveaways, contests, and selecting winners fairly from video comments.

Enter views and a playback CPM, video RPM, or Shorts RPM for estimated daily, 30-day, and yearly revenue in USD before costs and taxes.

Enter your monthly Shorts views and niche RPM range to estimate expected Shorts revenue and compare potential returns against long-form videos.

Free online tool to extract tags and keywords from any YouTube video URL. Analyze video tag strategy, get SEO insights, and copy tags in multiple formats for your own content optimization.

Paste a YouTube URL or video ID to preview and save the thumbnail sizes that exist for that video, including HD when it is available.

Calculate total watch time for YouTube playlists or video sets. Enter video durations to see total hours and track progress toward the 4,000 watch hour monetization requirement.

Estimate how long you'd survive a zombie apocalypse based on your location population density, available food supplies, weapon access, and cardio fitness level.

Enter damage, fire rate, magazine, reload and critical-hit settings to get raw, sustained and effective damage per second, burst damage and time to kill.

Predict the probability of a snow day based on weather conditions including temperature, snowfall forecast, wind speed, and more. Get a detailed factor-by-factor breakdown of your snow day chances.

Enter a ratio and one side, in pixels, to get the other side for video, photos, or social posts.

Enter travel, home energy, diet, and shopping habits to get your estimated annual carbon footprint with reduction tips and comparisons to global averages.

Enter air temperature and relative humidity to calculate apparent temperature and shade-level heat danger using the NWS formula.

Calculate the wind chill temperature from air temperature and wind speed using the official NWS formula. Includes frostbite risk assessment, step-by-step calculation, and interactive wind chill chart.

Enter your game, mouse DPI and sensitivity to convert settings for supported FPS games. Compare the results and the mouse distance for a 360° turn.

Convert real money (USD, EUR, GBP) to in-game currencies for popular games like Fortnite V-Bucks, Roblox Robux, Genshin Impact Primogems, and more. Find the best value packs and compare exchange rates instantly.

Calculate the probability of getting a 5-star or featured character in gacha games like Genshin Impact, Honkai Star Rail, Wuthering Waves, and more. Visualize pity curves and estimate pulls needed.

Enter drop rate percentage, desired items, and up to 1,000,000 attempts to calculate your probability curves and expected attempts.

Enter air temperature and relative humidity to get the dew point by the Magnus formula, plus a comfort note, frost point and wet-bulb estimate.

Generate pure audio tones at any frequency from 1 Hz to 20,000 Hz. Features real-time waveform and spectrum visualization, multiple wave types, musical note presets, binaural beats, and frequency sweep modes.

Free online click counter tool to count clicks, taps, and keystrokes. Features multiple counters, CPS tracking, keyboard shortcuts, sound effects, and full mobile touch support.

Enter both x, y, z coordinates to get Euclidean distance, the midpoint, the displacement vector, and direction angles.

Plot interactive 3D surfaces z = f(x, y) with mouse rotation, zoom and pan. Adjust the x/y domain, mesh resolution, colour map, wireframe and lighting to explore saddle points, ripples, paraboloids and the sinc surface.

Plan an A/B test before you launch. Enter baseline conversion rate, minimum detectable effect, significance level and power to get the required sample size per variant, the total sample, and the test duration at your traffic.

Enter visitors and conversions for control and variant groups to calculate uplift, p-value, and confidence level with a win/lose verdict.

Calculate the absolute value (modulus) of any real or complex number. See step-by-step solutions, number line visualization, and distance-from-zero animation.

Solve equations involving absolute values step by step. Shows both positive and negative cases with detailed explanations and verification.

Solve inequalities involving absolute values (e.g., |x+a| < b, |x-2| > 3). Understand 'and' vs 'or' conditions with detailed step-by-step solutions.

Convert between adjacency matrix, edge list, and adjacency list. Auto-detects directed/undirected graphs, computes degree sequence, density, connected components, and matrix powers — with an interactive SVG graph visualization.

Solve classic age word problems step by step: one person N years older than another, ratios in Y years, three-person age ratios and father-son puzzles. Sets up the algebra, solves the system, verifies it and draws a timeline.

Simplify complex algebraic expressions by combining like terms, applying the distributive property, and reducing fractions. Features step-by-step solutions, multiple simplification modes, and detailed explanations.

Enter two integers or one number to auto-find its partner, view step-by-step divisor sigma breakdowns, and verify amicable number pairs.

Calculate the angle between two 2D or 3D vectors using the dot product formula cos(θ) = (a·b)/(|a||b|). Get step-by-step solutions, results in both degrees and radians, interactive vector diagram, and geometric interpretation.

Calculate the angle bisectors of a triangle. Enter three sides or three vertex coordinates to find bisector lengths, division points on opposite sides, incenter, inradius, and see an interactive diagram with step-by-step formulas.

Perform one-way ANOVA test to determine if there are significant differences among group means. Includes complete ANOVA table, effect size (eta-squared, omega-squared), interactive visualizations, and step-by-step hypothesis testing.

Calculate the antilogarithm (antilog) of any number with any base. Features step-by-step calculation, interactive visualization, base comparison chart, and comprehensive explanations of logarithmic functions.

Calculate arc length, radius, or central angle of a circle sector with interactive diagram, step-by-step solution, and support for degrees and radians.

Calculate arccos (inverse cosine) instantly with interactive unit circle visualization, step-by-step solutions, degree and radian outputs, and up to 1000 decimal places precision.

Calculate the inverse sine (arcsin) of any value between -1 and 1. Get results in degrees or radians with adjustable precision up to 1000 decimal places, interactive unit circle diagram, step-by-step solution, and general solution formulas.

Calculate arctan (inverse tangent) with high precision. Get the angle whose tangent equals your input value, displayed in both degrees and radians with interactive unit circle visualization and step-by-step solution.

Calculate the angle between the positive x-axis and a point (x, y) using atan2, with an interactive diagram, a step-by-step solution and high-precision output up to 1000 decimal places for programming, robotics and navigation.

Enter a radius, diameter, or circumference to get the circle's area and its other measurements, with the steps.

Calculate the area of a parallelogram using three methods: base and height, two sides with included angle, or diagonals with intersection angle. Get step-by-step calculations with formulas.

Calculate the area of a sector of a circle with interactive SVG diagram, step-by-step calculation, arc length, and comprehensive sector formulas using radius and central angle.

Calculate the area of a trapezoid instantly with our interactive calculator. Features a dynamic visual diagram, step-by-step formula breakdown, and support for various unit systems.

Calculate ellipse area instantly with our free tool. Get area, perimeter (Ramanujan formula), eccentricity, and interactive visualization. Perfect for geometry, engineering, and design calculations.

Calculate the area of an equilateral triangle from side length, height, or perimeter. Includes step-by-step formulas, interactive triangle diagram, and complete property calculations.

Enter a list of numbers separated by commas, spaces, or line breaks to calculate their arithmetic mean, median, mode, range, variance, and standard deviation.

Calculate the nth term and sum of arithmetic sequences with step-by-step solutions, interactive visualizations, and high-precision results up to 1000 decimal places.

Calculate mean, median, mode, geometric mean, harmonic mean, and weighted average with complete statistical analysis, visualizations, and step-by-step solutions.

Calculate the average absolute deviation (AAD) of a dataset from the mean or median. Includes step-by-step calculations, visual distribution chart, and comprehensive statistical analysis.

Enter a function f(x) and interval bounds [a, b] to compute the secant line slope with step-by-step MathJax formulas and a visual graph.

Convert integers between any number bases from binary (base-2) to base-36 with multi-base preview, step-by-step conversion breakdown, and digit position analysis.

Convert integers between any number bases from 2 to 36 with step-by-step calculation breakdown and digit position analysis.

Calculate posterior probability using Bayes' theorem. Enter prior probability, likelihood, and false positive rate to get step-by-step solutions with probability tree diagrams and natural frequency visualizations.

Enter P(x), Q(x), exponent n, and initial conditions to linearize the Bernoulli equation, find a closed-form solution, and plot the slope field.

Calculate beta distribution probabilities from shape parameters alpha and beta. Get P(X <= x), P(X >= x) or an interval, with interactive PDF and CDF graphs, shaded regions, step-by-step solutions, mean, variance, mode and skewness.

Calculate the beta function B(x, y) with step-by-step calculations, gamma function relationship, interactive visualization, and detailed mathematical explanations.

Perform binary arithmetic (add, subtract, multiply, divide) and bitwise operations (AND, OR, XOR, NOT, shifts). Interactive step-by-step solutions with multi-base results in binary, decimal, and hexadecimal.

Convert binary numbers to decimal, hexadecimal, octal, and any base (2-36). Get instant results with visual bit diagrams, step-by-step explanations, and grouped formatting for easy reading.

Convert binary (base-2) numbers to decimal (base-10) with an interactive bit-by-bit breakdown showing how each digit contributes to the final value through powers of 2.

Convert binary (base-2) numbers to hexadecimal (base-16) with visual bit grouping, step-by-step conversion process, interactive diagrams, and comprehensive number system education.

Convert binary numbers to octal with interactive visualization showing bit grouping, step-by-step conversion process, and comprehensive number system education.

Calculate binomial coefficients C(n, k) with step-by-step solutions, Pascal's triangle visualization, and real-world probability applications.

Calculate binomial probabilities P(X=k), cumulative probabilities P(X≤k), P(X≥k), with interactive PMF/CDF charts, step-by-step solutions, and complete distribution tables.

Expand (a+b)^n using the binomial theorem. Get step-by-step expansion with each term, binomial coefficients, Pascal's triangle visualization, and detailed coefficient analysis.

Perform bitwise operations (AND, OR, XOR, NOT) and bit shift operations on integers with interactive visual bit diagrams showing each bit position.

Simplify Boolean expressions with algebraic laws, Quine-McCluskey and Karnaugh maps. Enter any AND, OR, NOT, XOR, NAND or NOR expression to get the minimal SOP/POS form, truth table, K-map, gate diagram and NAND-only equivalents.

Enter up to 10 sets of numbers. Get a box plot with quartiles, whiskers, and outliers.

Enter two numbers and select addition or subtraction to watch column-by-column carrying and borrowing steps, including cascading borrows across zeros.

Enter x and y coordinates and precision up to 1000 decimals to get polar coordinates (r, θ) with quadrant analysis and step-by-step verification.

Generate the n-th Catalan number with a step-by-step formula derivation, interactive parenthesization and polygon-triangulation visuals, a full sequence table and the combinatorial meaning behind each interpretation.

Compute the ceiling ⌈x⌉ and floor ⌊x⌋ of any real number. See step-by-step solutions, interactive number line, staircase graph, and fractional part analysis.

Calculate probabilities using the Central Limit Theorem (CLT) with interactive visualizations, step-by-step solutions, and Z-score calculations for sample means.

Calculate the characteristic polynomial det(A − λI) of a square matrix. Supports 2×2 to 6×6 matrices with step-by-step cofactor expansion, eigenvalue extraction, coefficient analysis, and interactive polynomial visualization.

Run a chi-square test of independence to see whether two categorical variables are significantly associated. Get the chi-square statistic, p-value, expected frequencies, cell contributions and Cramer's V effect size, step by step.

Solve systems of simultaneous congruences with the Chinese Remainder Theorem. Find the smallest x satisfying several modular equations, with an Extended Euclidean Algorithm breakdown, a number-line visual and verification.

Decompose a symmetric positive-definite matrix into A = LLᵀ with animated step-by-step computation. See each element of the lower-triangular matrix L derived with full formulas, verify the result, and explore the factorization visually.

Calculate radius, diameter, circumference, and area of a circle from any single value. Includes arc length, sector area, chord length, and segment area calculations with step-by-step solutions and interactive diagram.

Calculate the circumscribed circle (circumcircle) of a triangle. Enter three sides or three vertex coordinates to find the circumradius, circumcenter, area, angles, and see an interactive diagram with step-by-step formulas.

Calculate Coefficient of Variation (CV) with step-by-step formulas, visual comparison charts, data quality assessment, and comprehensive statistical analysis for your datasets.

Calculate Cohen's d effect size to measure the standardized difference between two group means. Features step-by-step calculations, interactive visualization, effect size interpretation, and support for both raw data and summary statistics.

Solve classic coin word problems step by step: N coins totalling a given amount, twice as many quarters as dimes, three-coin mixtures with count relationships, and fewest coins to make an amount. Animates the coin stacks.

Explore the Collatz conjecture (3n+1 problem) by generating the hailstone sequence for any positive integer. Visualize the trajectory, analyze stopping time, peak values, and sequence statistics with interactive charts.

Find the column space and basis of any matrix using row reduction. See each row operation step by step with pivot column highlighting, rank, dimension, and interactive visualization for 2D/3D column spaces.

Calculate combinations C(n,k) with step-by-step solutions, Pascal's Triangle visualization, interactive diagrams, and detailed formula breakdowns for combinatorics problems.

Find common factors of two or more numbers with interactive Venn diagram, step-by-step explanations, GCF calculation, and multiple solving methods including prime factorization.

Compare two fractions with step-by-step explanations, visual pie charts, and interactive diagrams to see which fraction is larger or smaller.

Calculate the complementary error function erfc(x) with interactive visualization, step-by-step solution, and comprehensive erfc table for values from -3 to 3.

Enter quadratic coefficients a, b, and c to solve quadratic equations by completing the square, find the vertex form, and view step-by-step algebra.

Perform operations with complex numbers: add, subtract, multiply, divide, convert forms, calculate modulus, argument, conjugate, powers and roots with detailed step-by-step solutions and interactive complex plane visualization.

Calculate compound annual growth rate (CAGR), future value, initial value, or time periods with interactive growth charts, detailed breakdowns, and comprehensive analysis for investments and business growth.

Generate the 2D flat pattern of a cone or truncated cone. Calculates the outer radius, inner radius and sweep angle you need to cut the unrolled template from sheet metal, cardboard or paper for DIY, HVAC ductwork and crafting.

Calculate confidence intervals for means and proportions with interactive visualization, t-distribution and z-distribution support, step-by-step calculations, and sample size recommendations.

Calculate confidence intervals for population proportions using Wald (normal approximation) or Wilson score methods. Get step-by-step solutions, visual diagrams, margin of error analysis, and practical interpretation guidance.

Enter coefficients A through F of a second-degree polynomial. Instantly identify circles, ellipses, parabolas, or hyperbolas with step-by-step properties.

Enter categorical counts up to a 20x20 table size. Get expected frequencies, standardized residuals, Cramér's V, and chi-square test results.

Convert any decimal, fraction, or square root to its continued fraction representation with convergents, step-by-step Euclidean algorithm, and interactive visualization.

Calculate the conversion rate from visitors to conversions, with Wilson, Wald, and Agresti-Coull confidence intervals, margin of error, sample-adequacy check, and an animated funnel to gauge reliability for A/B testing and funnel analysis.

Calculate linear, circular, and continuous convolution of signals and functions with interactive visualizations, detailed step-by-step solutions, and comprehensive mathematical analysis.

Calculate the distance, midpoint, slope, line equation, perpendicular bisector, and angle of inclination between two points on a coordinate plane. Enter coordinates to get step-by-step solutions with an interactive diagram.

Enter paired x and y values. Get Pearson, Spearman, and Kendall correlations, a scatter plot, and p-values.

Calculate cosecant, secant and cotangent with precision from 1 to 1000 decimal places. Includes an interactive unit circle, domain validation, a step-by-step explanation and one-click copy of any result.

Calculate the cosine of any angle with high precision, interactive unit circle visualization, cosine wave graph, step-by-step solutions, and special angle recognition. Supports degrees and radians.

Solve systems of 2 or 3 linear equations using Cramer's rule. Enter coefficients, get step-by-step determinant calculations with animated matrix visualization, geometric interpretation graph, and the complete solution.

Solve proportions using cross multiplication. Find the unknown value in a/b = c/d equations with step-by-step solutions and visual diagrams.

Enter two 3D vector coordinates to calculate their cross product, perpendicular vector, and parallelogram area with step-by-step determinant expansion.

Calculate the cube (n³) and cube root (∛n) of any number with step-by-step solutions, perfect cube detection, and interactive visualizations.

Generate and explore cube numbers with interactive visualizations, 3D cube diagrams, step-by-step calculations, and multiple export formats. Perfect for students, teachers, and math enthusiasts.

Calculate the cube root of any number with precision up to 1000 decimal places. Features interactive 3D cube visualization, root comparison chart, perfect cube finder, step-by-step solution, and practical volume-to-side converter.

Solve any cubic equation ax³+bx²+cx+d=0 using Cardano's formula. Get all three roots (real and complex), step-by-step solution, discriminant analysis, and interactive graph.

Calculate the curl of any 2D or 3D vector field with a step-by-step determinant expansion. Enter the component functions, get the symbolic curl, evaluate it at a point, spot irrotational fields and view a vorticity overlay.

Enter y=f(x) or a parametric curve and a point to get curvature, the radius of curvature and the osculating circle, with derivative steps.

Convert angles from decimal degrees (e.g., 30.263889°) to Degrees, Minutes, Seconds (DMS) format (e.g., 30° 15' 50"). Supports GPS coordinates, navigation, and surveying applications with step-by-step conversion and visual breakdown.

Convert decimal (base-10) numbers to binary (base-2) instantly. Get step-by-step division method breakdown, visual bit diagrams, grouped binary output, and multi-base conversions including octal and hexadecimal.

Convert any decimal number to a fraction with step-by-step visual explanation, multiple output formats, and interactive fraction visualization.

Convert decimal (base-10) numbers to hexadecimal (base-16) with interactive visualization, step-by-step conversion process, and detailed explanations for programming and digital electronics.

Convert decimal (Base-10) numbers to octal (Base-8) instantly with visual step-by-step division method, binary-octal grouping, bit pattern visualization, and comprehensive number system education.

Convert decimal numbers to percentages with visual representation, step-by-step calculation, batch conversion support, and precision control. Perfect for math, finance, and data analysis.

Enter a decimal to get scientific notation, E-notation and engineering notation, with the steps that shift the decimal point.

Convert degrees to radians instantly with interactive unit circle visualization, step-by-step formulas, common angle references, and bidirectional conversion support.

Enter 2D points to build a Delaunay mesh coloured by triangle quality, check the empty-circle property and overlay the Voronoi dual.

Calculate the number of derangements (subfactorial !n) of n elements, where nothing stays in its original position. Includes a step-by-step inclusion-exclusion formula, a visualization, a derangement table and probability analysis.

Calculate derivatives instantly with step-by-step solutions. Supports single-variable, partial, implicit, and directional derivatives with interactive visualizations.

Enter a polynomial's coefficients, up to degree 20, to see the sign changes and possible counts of positive and negative real roots.

Enter a square matrix of up to 10 by 10 to get its determinant by cofactor expansion, with the steps and matrix properties.

Calculate the digital root of any number by repeatedly summing its digits until one digit remains. Supports additive and multiplicative modes, bases 2, 8, 10 and 16, an animated breakdown, formula check and persistence counter.

Enter a weighted graph and the start and end to get the shortest path, a priority-queue trace and the path tree. Limited to 50 nodes and 200 edges.

Enter a first-order ODE and an x-y window to plot the slope field, add up to 8 solution curves and see the equilibrium nullclines.

Enter a multivariable function, a point and a direction to get the directional derivative and gradient, with steps. The maximum equals the gradient's magnitude.

Enter the coordinates of two points to get the Euclidean distance, the midpoint, the slope and the line equation, with formula steps.

Solve for distance, speed or time given the other two. Pick the unknown on an interactive triangle, mix units freely, enter time as 1h 30m or 5400 sec, and use bonus modes for multi-leg average and round-trip harmonic-mean speed.

Calculate the divergence of any 2D or 3D vector field with step-by-step partial derivatives. Enter the component functions, get the symbolic divergence, evaluate it at a point, identify sources and sinks, and view a heat map.

Enter a number and a ratio or fraction to split it into two parts, with the steps and a balance view. Decimals can run to 10 places.

Enter an integer of up to 15 digits and one or more divisors to test each, see the rules for 2 through 12 and list divisors, with up to 50 shown.

Enter DMS coordinates or batch paste up to 50 lines to convert degrees, minutes, and seconds into decimal degrees for GPS and GIS mapping.

Enter a function such as 1/(x-2), sqrt(x) or log(x) to get its domain and range in interval notation, with the analysis steps.

Enter two vectors in 2D, 3D or up to 50 dimensions to get the dot product, the angle between them and the scalar and vector projections.

Enter a function, integration variables, and optional limits to compute double integrals with step-by-step solutions and 3D surface plots.

Calculate and visualise effect sizes including Cohen's d, Hedges' g, Glass's delta, eta-squared, omega-squared and Cohen's f. See animated distribution overlap, step-by-step formulas, CLES probability and interpretation guidelines.

Enter a numerator and denominator to write the fraction as distinct unit fractions, comparing the greedy, binary and practical methods.

Multiply two whole numbers the ancient Egyptian way, by repeated doubling and selective adding. Watch the doubling table build row by row, see which powers of two are chosen, and learn why the trick is really binary arithmetic.

Enter a 2×2 or 3×3 matrix to get its eigenvalues and eigenvectors, the characteristic polynomial and the solution steps.

Enter the semi-major and semi-minor axes to calculate the perimeter of an ellipse using Ramanujan and infinite series formulas with an SVG diagram.

Calculate Shannon entropy of probability distributions with step-by-step formulas, interactive visualizations, entropy classification, and educational insights for information theory analysis.

Enter two points, a point and a slope, or a slope and y-intercept to get all three line forms, with a graph and the steps.

Enter one fraction to list equivalents, up to 100 of them, or enter two fractions to test whether they are equivalent, with bars and a number line.

Choose erf, erfc or the inverse, then enter x and a precision up to 15 decimal places, to get the value with steps on a Gaussian curve.

Enter an arithmetic expression to estimate it with more than one rounding method, and see the steps, a number line and the error of each estimate.

Enter vertices, edges and faces to compute V − E + F, then see the genus, the surface type and a comparison with the Platonic solids.

Solve any first-order ODE numerically with Euler's method. See the iteration table, the Euler polygon drawn on the slope field, and a convergence comparison at h, h/2 and h/4, with optional error analysis against a closed form.

Calculate Euler's totient function φ(n) with step-by-step prime factorization, interactive coprime number grid, and detailed analysis. Essential for RSA cryptography, modular arithmetic, and number theory.

Quickly check if numbers are even or odd. Supports batch input with visual grouping, divisibility explanations, number line visualization, and detailed parity analysis.

Multiply and expand polynomials (binomials, trinomials, and higher-degree expressions) using FOIL method and Binomial Theorem. Get step-by-step solutions with detailed explanations.

Calculate exponential decay with interactive visualizations, half-life computation, decay constant, and step-by-step solutions. Solve for initial amount, final amount, decay rate, or time.

Calculate exponential distribution probabilities and explore its properties. Enter the rate parameter and a value to get P(X <= x), P(X > x) and interval probabilities, plus mean, variance, median, PDF and CDF curves and worked steps.

Solve exponential equations step by step. Supports simple, linear exponent, coefficient, two-base, and quadratic-in-exponential forms. Get detailed solutions with domain analysis and interactive graphs.

Calculate exponential growth and decay with step-by-step solutions, interactive growth curve visualization, and high-precision results for population, investment, and scientific modeling.

Calculate the exponential integral Ei(x) with high precision, interactive visualization, and detailed step-by-step mathematical derivation.

Calculate exponents (powers) with high precision. Supports fractional exponents, negative exponents, and provides detailed step-by-step solutions with visual explanations and exponent rule demonstrations.

Calculate the GCD of two integers and find Bézout coefficients using the Extended Euclidean Algorithm, with step-by-step table, back-substitution, and modular inverse.

Calculate F-statistic and p-value for ANOVA, two-sample variance tests, and regression analysis. Get step-by-step solutions with interactive F-distribution curve visualization, critical value tables, and hypothesis test conclusions.

Calculate all factors of a number step by step with factor pairs visualization, interactive factor tree diagram, prime factorization, and comprehensive number analysis including perfect square detection.

Calculate the factorial of any non-negative integer (n!) with step-by-step expansion, scientific notation for large numbers, digit count analysis, and factorial growth visualization. Supports values up to 1 million.

Enter real or complex samples and a sample rate to compute discrete FFT magnitude, phase, frequency bins, and dominant peaks.

Check whether any positive integer belongs to the Fibonacci sequence. Uses Gessel's perfect-square theorem for an O(1) test, reveals the exact index, shows the Zeckendorf representation and plots the golden ratio convergence.

Enter numbers separated by commas, spaces, or new lines to find the minimum and maximum and see the set sorted.

Enter a count from 10 to 1000 to generate digits of Euler's number and calculate digit frequencies, mean values, and consecutive run lengths.

Generate and analyze the first n digits (up to 10,000) of Pi (π) with comprehensive digit frequency analysis, pattern exploration, interactive visualizations, and unique Pi-themed insights.

Enter a number from 1 to 10,000 to get a list of consecutive prime numbers, identify twin primes, and view the gaps between each prime.

Enter dy/dx = f(x, y), initial values, and an x range to solve the differential equation and generate a slope field with a solution curve.

Enter the four counts of a 2×2 table to get one-tailed and two-tailed Fisher's exact p-values, the odds ratio, and relative risk.

Calculate the five-number summary (minimum, Q1, median, Q3, maximum) for any dataset. Features an interactive box-and-whisker plot, step-by-step quartile calculations, outlier detection, and multiple calculation methods.

Enter a periodic function and its interval to calculate Fourier coefficients a0, an, and bn. Up to 20 terms are computed at once.

Perform fraction arithmetic with our interactive calculator. Get step-by-step solutions, visual diagrams, and results in multiple formats including mixed numbers and decimals.

Simplify any fraction to lowest terms with interactive bar diagrams, step-by-step prime factorization, and animated GCF visualization. Perfect for students learning fraction reduction.

Convert any fraction to its decimal equivalent with interactive long division visualization, repeating decimal detection, and step-by-step explanations. Perfect for students and educators.

Convert any improper fraction to a mixed number instantly with animated visual diagrams, step-by-step division breakdown, and educational explanations. Perfect for students, teachers, and anyone learning fractions.

Convert fractions to percentages instantly with visual pie charts, animated progress bars, step-by-step solutions, and support for mixed numbers. Perfect for students, teachers, and professionals.

Calculate the volume, lateral surface area, total surface area, and slant height of a frustum (truncated cone). Enter the top radius, bottom radius, and height to get instant results with step-by-step formulas and an interactive 3D diagram.

Enter f(x) and g(x) to calculate both compositions, with algebraic steps for (f ∘ g)(x) and (g ∘ f)(x).

Enter up to three functions and your axis ranges to plot curves and find up to 10 intercepts and 5 vertical asymptotes.

Determine whether a function is even, odd or neither, with a step-by-step algebraic proof, symmetry graph, numerical verification table and even-odd decomposition. Handles polynomial, trig, exponential, log and absolute value functions.

Calculate the Gamma function with step-by-step solutions, interactive graphs, and factorial comparison tables. Supports both positive and negative real numbers.

The ultimate tool to solve any triangle. Input three known values (e.g., SSS, SAS, ASA, AAS) and automatically calculate all missing sides, angles, area, and perimeter using the law of sines, law of cosines, and Heron's formula.

Calculate geometric distribution probabilities for the number of trials until the first success. Enter the per-trial success probability and the trial number to get the PMF, CDF, cumulative probabilities and step-by-step solutions.

Calculate the geometric mean of any dataset with step-by-step formulas, interactive visualization, comparison with arithmetic mean, and comprehensive statistical analysis.

Calculate the nth term, sum of first n terms, and infinite sum of any geometric sequence with step-by-step solutions and interactive visualization.

Calculate the Gini coefficient to measure inequality of a distribution using the Lorenz curve approach. Features step-by-step calculation, interactive Lorenz curve visualization, quintile analysis, and inequality interpretation.

Enter an even integer greater than 2 to list every pair of primes that adds up to that number.

Calculate golden ratio proportions from any number. Generate phi-based sequences, find complementary segments, golden rectangle dimensions, and explore the divine proportion with step-by-step calculations and visualizations.

Calculate golden rectangle dimensions from any side length. Visualize the golden ratio (φ ≈ 1.618) with interactive diagrams showing interior and outer rectangles, plus step-by-step formulas.

Calculate the missing values to complete the golden section. Enter any value (a+b, a, or b) to find the golden ratio proportions with step-by-step explanation and visual diagram.

Calculate the gradient vector of a multivariable function. Enter f(x, y) or f(x, y, z) to get every partial derivative, evaluate the gradient at a point, read its magnitude and direction, and view a 2D gradient field.

Orthonormalize a set of linearly independent vectors using the Gram-Schmidt process. Get step-by-step projections, orthogonal and orthonormal bases, verification of orthogonality, and an interactive vector visualization.

Find the chromatic number and a valid vertex colouring for any undirected graph. Enter edges or an adjacency list to get the minimum number of colours, a colour assignment, an animated DSATUR walkthrough and a graph visualization.

Use the Havel-Hakimi algorithm to determine if a given sequence of numbers can form a simple, undirected graph. Features animated step-by-step visualization, adjacency matrix, and a sample graph rendering.

Enter two latitudes and longitudes to get the distance in kilometres, miles, and nautical miles, plus bearings and the midpoint.

Calculate the greatest common factor (GCF) of two or more numbers with step-by-step solutions using multiple methods.

Compute the order of every element in a finite group, check whether it is abelian or cyclic, render the Cayley table as a colour-coded heatmap, and view the subgroup lattice as a Hasse diagram. Covers cyclic, dihedral and symmetric groups.

Calculate half-life, initial quantity, remaining quantity, or elapsed time in exponential decay with interactive decay curve visualization, step-by-step formulas, and preset isotope values.

Enter a graph of up to 20 vertices to check for a Hamiltonian path or cycle. A witness route is shown when one exists.

Determine if a number is a happy number by repeatedly replacing it with the sum of the squares of its digits. Visualize the happiness journey, explore patterns, and find all happy numbers in any range.

Calculate the harmonic mean of a data set with step-by-step formulas, comparison with arithmetic and geometric means, interactive visualization, and practical examples for rates, speeds, and financial analysis.

Calculate the area of a triangle from its three sides with Heron's formula. Get the semi-perimeter, area, perimeter, inradius, circumradius, all three altitudes, interior angles and triangle type, with an interactive diagram.

Perform hexadecimal addition, subtraction, multiplication, division, and bitwise operations (AND, OR, XOR, NOT, shifts). Get step-by-step solutions with multi-base results in hex, decimal, and binary.

Enter a hexadecimal number to convert it to decimal, binary, octal or another base from 2 to 36. See the value of each digit and the conversion steps.

Convert hexadecimal (Base-16) numbers to binary (Base-2) with visual digit mapping, step-by-step conversion breakdown, and one-click copy.

Convert hexadecimal (base-16) numbers to decimal (base-10) instantly. See step-by-step conversion process, positional notation breakdown, and results in multiple bases.

Convert hexadecimal (base-16) numbers to octal (base-8) instantly. Get step-by-step conversion breakdown, visual diagrams, and multi-base results including decimal and binary.

Create beautiful histograms online with comprehensive statistical analysis including mean, median, mode, skewness, kurtosis, and distribution shape detection. Supports auto-optimal bin calculation and PNG export.

Calculate the center, vertices, foci, asymptotes, eccentricity, and equations of any hyperbola. Supports standard form and general form with interactive graph and step-by-step solutions.

Calculate hyperbolic functions (sinh, cosh, tanh) and their inverses (asinh, acosh, atanh) with adjustable precision from 1 to 1000 decimal places. Features step-by-step solutions, interactive graphs, and identity verification.

Calculate hypergeometric probabilities for sampling without replacement. Enter population size, success states, draws and observed successes to get exact and cumulative probabilities, PMF charts, worked steps and urn visualizations.

Enter the lengths of side a and side b to calculate the hypotenuse, internal angles, perimeter, and area of a right triangle with step-by-step solutions.

Compute derivatives of implicit functions F(x,y)=0 with detailed step-by-step solutions. Supports polynomials, trigonometric, exponential, and logarithmic functions up to 5th order derivatives.

Enter an integrand and bounds, including infinity. Evaluate Type I and Type II improper integrals and see whether they converge, with steps.

Enter elements or intersection sizes for up to five sets. See the union size, the signed expansion, and each region of the Venn diagram.

Solve linear, quadratic, polynomial, and rational inequalities with step-by-step solutions. Display results graphically on a number line and in interval notation.

Calculate the exact sum of convergent infinite series including geometric, telescoping, p-series, and well-known special series. Get step-by-step convergence proofs with animated partial sum visualizations.

Calculate the incircle of a triangle. Enter three sides or three vertex coordinates to find the inradius, incenter, tangent points, tangent lengths and contact triangle, with an interactive diagram and step-by-step formulas.

Calculate the instantaneous rate of change of any function at a point using the limit definition. Get step-by-step solutions with MathJax formulas, an interactive tangent line graph and a convergence table as h approaches zero.

Calculate definite and indefinite integrals with detailed step-by-step solutions, interactive function visualization, and comprehensive explanations for calculus students and professionals.

A premium interactive unit circle tool. Drag to explore angles, snap to special values, see all 6 trig functions live, copy values instantly, and learn with step-by-step breakdowns and exact fractional values.

Paste a list of numbers. See Q1, Q2, Q3, the IQR, the five-number summary, and outliers, with a box plot and steps.

Calculate the inverse function f^(-1)(x) of a given function f(x) with detailed step-by-step instructions showing how to find the inverse algebraically.

Compute the inverse Laplace transform of F(s) to find f(t). Get step-by-step solutions, visualizations, and understand the transformation from frequency domain to time domain.

Input up to 100 vertex coordinates or draw on the canvas to find polygon area, perimeter, and centroid with step-by-step calculations.

Check if a number is prime with detailed analysis, factorization, and visual number line representation.

Enter function components and variables (up to 6 each) to calculate the Jacobian matrix, determinant, eigenvalues, and worked steps.

Compute the Jordan canonical form of a square matrix plus the transition matrix P with P inverse A P = J. Handles defective, non-diagonalizable matrices via generalized eigenvectors, with kernel-chain analysis and a block diagram.

Minimize Boolean functions with Karnaugh maps. Enter minterms, maxterms or toggle a truth table to get the simplified sum-of-products or product-of-sums expression, colour-coded groupings, prime implicants and worked steps.

Compare up to 20 independent groups to get Kruskal-Wallis H test results, rank analyses, effect sizes, and step-by-step calculations.

Enter a numerator, a denominator, and the point, including infinity. Evaluate 0/0 or infinity-over-infinity forms by differentiating, with steps.

Enter a function of t. See its Laplace transform with steps and both the time-domain and s-domain pictures.

Solve triangles using the Law of Cosines. Supports SAS (Side-Angle-Side) and SSS (Side-Side-Side) cases. Get step-by-step solutions, interactive triangle visualization, area, perimeter, and triangle classification!

Use the Law of Sines to find unknown sides or angles in a triangle. Supports the ASA, AAS and SSA cases with ambiguous-case detection, and gives step-by-step solutions with a detailed explanation of each stage.

Calculate the least common multiple (LCM) of two or more numbers with interactive prime factorization visualization, step-by-step solutions, and multiple calculation methods explained.

Calculate limits of mathematical functions with detailed step-by-step solutions. Supports one-sided limits, indeterminate forms, and L'Hospital's Rule.

Calculate line integrals of scalar and vector fields along parametric curves in 2D and 3D. Enter the field, parametric equations and bounds for symbolic results with step-by-step solutions, arc length and a curve visualization.

Solve single-variable linear equations (e.g., ax + b = c) with detailed step-by-step solutions. Shows all algebraic manipulations and verifies the answer.

Solve linear programming problems with the simplex method. Supports maximize or minimize objectives, mixed constraints and up to eight decision variables, and for two-variable problems plots the feasible region with the optimum marked.

Calculate linear regression equation, slope, intercept, R-squared, and make predictions with interactive scatter plot visualization and step-by-step formula breakdown.

Choose a count, a maximum value, or a start and end index. See that Fibonacci list, with a golden-ratio view and a spiral diagram.

Generate a comprehensive list of prime numbers from 2 to any specified number up to 10,000. Discover the building blocks of mathematics with instant results and detailed statistics.

Solve literal equations and rearrange multi-variable formulas. Enter any equation like A = πr², choose a variable, and get the isolated solution with step-by-step algebraic manipulation.

Enter a number and a base, or choose natural log, log base 10, or log base 2. See the logarithm with steps.

Calculate common logarithms and inverse powers of 10 with adjustable display precision, batch input, calculation steps and conditional scientific interpretations.

Calculate the binary logarithm (log base 2) of any positive number with detailed step-by-step explanations, visual representations, and comprehensive insights into logarithmic properties.

Solve logarithmic equations step by step. Supports log, ln, and custom bases. Enter any log equation and get the solution with detailed steps, domain analysis, and interactive graph.

Enter initial value, growth rate, time, and base to calculate logarithmic growth curves. Generates year-by-year tables for up to 100 years.

Visualize addition and subtraction step by step with column-by-column carrying and borrowing. Color-coded animations show each digit computation for easy learning.

Solve long division problems step by step. See the full working process with quotient, remainder, and decimal expansion. Perfect for learning and verifying division.

Enter two numbers up to 999,999,999,999 to see the long multiplication solution with aligned columns, carry digits, and partial products.

Compute the Maclaurin series expansion of common functions at x = 0. Get the nth-order polynomial terms, a Lagrange remainder estimate, the radius of convergence and an animated graph of partial sums converging to the function.

Generate magic squares of any order N where every row, column, and diagonal sums to the same magic constant. Includes step-by-step construction, interactive visualization, and mathematical properties.

Paste two independent samples. Get the Mann-Whitney U statistic, a p-value, an effect size, and the rank-sum steps.

Calculate the steady-state (stationary) distribution of a Markov chain from its transition matrix. Includes interactive state diagram, convergence visualization, step-by-step solution, and power iteration analysis.

Calculate matrix operations with step-by-step solutions: addition, subtraction, multiplication, inverse, transpose, and determinant. Visual matrix display with detailed explanations.

Diagonalize a square matrix by computing eigenvalues, eigenvectors, and the decomposition A = PDP⁻¹. Supports 2×2 to 5×5 matrices with step-by-step solutions, characteristic polynomial, multiplicity analysis, and interactive visualization.

Compute the matrix exponential e^(At) and use it as the state transition matrix for linear ODE systems. Enter A, a time t and an optional initial vector to get x(t), Pade scaling details and an animated phase-plane flow diagram.

Enter a square matrix from 2x2 to 6x6. Get the inverse by Gauss-Jordan elimination, the determinant, and a check that A times A^-1 is I.

Enter a square matrix up to 8x8. Get the lower, upper, and permutation matrices from Gaussian elimination with partial pivoting.

Multiply two matrices up to 5x5 with step-by-step element computation and row-by-column breakdown.

Calculate the power of a square matrix A raised to any integer exponent n. See each multiplication step animated, intermediate matrices A¹ through Aⁿ, determinant and trace properties, with MathJax formulas and interactive visualization.

Enter a matrix up to 10x10. Get its rank from row echelon form, plus the column-space and null-space dimensions.

Calculate the trace of a square matrix (sum of diagonal elements), verify its equality with the sum of eigenvalues, explore trace properties, and visualize the diagonal with an interactive heatmap. Supports matrices up to 10×10.

Calculate Mean Absolute Deviation with step-by-step formulas, interactive visualization, and comprehensive statistical analysis. Understand data variability with our free MAD calculator.

Calculate the arithmetic mean (average) of any dataset with interactive visualization, step-by-step formula breakdown, and comprehensive statistics including sum, median, range, and standard deviation.

Calculate mean, median, mode and range with step-by-step formulas, interactive visualization, frequency analysis, and comprehensive statistical breakdown for any dataset.

Calculate the median absolute deviation (MAD) of a dataset with step-by-step formulas, interactive visualization, outlier detection, and robustness comparison to standard deviation.

Enter numbers separated by commas, spaces, or line breaks to calculate the median, range, minimum, and maximum with step-by-step explanations.

Sharpen mental arithmetic with drills across five difficulty levels, from single-digit addition to two-digit multiplication. Every problem names a strategy and shows an animated coach card, and the Daily Workout is the same worldwide.

Test whether 2^p - 1 is a Mersenne prime for a given exponent p. Uses the Lucas-Lehmer test with an animated iteration trace, a binary bit-pattern visual, Euclid-Euler perfect-number pairing and the 52 known Mersenne primes.

Calculate the midpoint between two points instantly with interactive visualization, step-by-step solution, distance calculation, and comprehensive geometry analysis.

Calculate the midrange of any dataset with step-by-step visualization showing the midpoint between maximum and minimum values, plus comprehensive statistics including mean, median, and range comparison.

Enter a weighted graph with up to 50 nodes and 200 edges to find the minimum spanning tree using Kruskal's or Prim's algorithm with visual steps.

Convert any mixed number to an improper fraction instantly with animated visual diagrams, step-by-step breakdown, and educational explanations. Perfect for students learning fractions.

Choose a problem type and enter concentrations and amounts. Solve a blend, a dilution with water, adding pure solute, or draining and replacing part of a mix.

Calculate the Mobius function for any positive integer, returning -1, 0 or +1 with full prime factorization, squarefree analysis, a step-by-step explanation, the Mertens function and a colour-coded heatmap of nearby integers.

Calculate the mode (most frequent values) of a dataset with interactive frequency visualization, step-by-step analysis, and comprehensive statistics.

Enter a base, an exponent, and a modulus. Get a^b mod n and the binary square-and-multiply steps.

Calculate the modular multiplicative inverse of an integer a under modulo m using the Extended Euclidean Algorithm, with step-by-step table, verification, and clock visualization.

Calculate modulo (remainder) with step-by-step division process, interactive visual diagrams, and support for integers, decimals, negative numbers, and scientific notation.

Calculate expressions with 3 or more fractions or mixed numbers. See multiplication/division precedence, common denominator steps, simplification, mixed-number answers, and visual fraction strips.

Enter numbers separated by commas, lines, or multiplication signs to get instant products with detailed step-by-step solutions and factor breakdowns.

Choose the row and column ranges and any multiples to highlight. Get a multiplication table you can print or export as a PDF.

Enter a number and an index n. Get the n-th root in radical and exponential form, with as many as 1000 decimal places, and the steps.

Calculate the natural logarithm ln(x) of any positive number with step-by-step derivation, interactive visualization, logarithm properties, related calculations, and mathematical insights.

Calculate negative binomial probabilities for the number of trials or failures needed to reach a target number of successes. Get the exact PMF and CDF, step-by-step solutions, interactive charts and trial sequence visualizations.

Compute the maximum flow from source to sink in a capacitated directed network using Ford-Fulkerson with Edmonds-Karp. Animates every augmenting path and shows residual capacities, saturated edges and the proving min-cut.

Find roots of equations with the Newton-Raphson method. Enter any function and an initial guess to see step-by-step iterations with tangent line approximations, convergence analysis and a graph tracing the path to the root.

Calculate probabilities for the normal (Gaussian) distribution including PDF, CDF, and inverse CDF with interactive bell curve visualization showing shaded probability areas.

Enter a matrix. Get a basis for the solutions of Ax = 0, the nullity, the row-reduction steps, and a rank-nullity check in exact fractions.

Generate animated number bond practice for early arithmetic. Pick a total from 5 to 100 and a Practice Quiz, Bond Chart or Fact Family mode, and each problem comes with a cherry diagram, a ten-frame and a two-colour bar model.

Calculate the number of digits in any integer, analyze digit distribution, and visualize the breakdown of each position value (ones, tens, hundreds, etc.).

Identify the pattern in a number sequence and predict the next values. Detects arithmetic, geometric, Fibonacci-like, quadratic, cubic, power, factorial, triangular, and prime patterns with step-by-step explanations.

Type a percent such as 75%, a repeating decimal, or a mixed number. Get the simplified fraction, the GCD steps, and a long-division check.

Enter a function and the interval. Compare Gauss-Legendre, Romberg, and adaptive Simpson results, with error and evaluation counts.

Perform addition, subtraction, multiplication, and division on octal (base-8) numbers with step-by-step visual explanations and instant decimal conversions.

Convert octal (base-8) numbers to binary, decimal, hexadecimal, and any base from 2 to 36 instantly. Free online octal number system converter with step-by-step conversion explanations.

Convert octal (base-8) numbers to binary (base-2) instantly with visual step-by-step conversion showing each digit mapping, interactive reference table, and educational breakdown.

Convert octal (base-8) numbers to decimal (base-10) with visual digit-by-digit breakdown, step-by-step calculations, and educational explanations.

Enter an octal number of up to 21 digits. Get the hexadecimal form, the binary in between, and the digit breakdown.

Calculate odds ratio, relative risk, confidence intervals, and number needed to treat from a 2×2 contingency table. Features animated forest plot, step-by-step solution with MathJax formulas, and clinical interpretation.

Find the maximum and minimum values of any function using the first and second derivative tests. Get critical points, intervals of increase and decrease, concavity analysis, inflection points and an interactive graph with worked steps.

Solve math expressions step by step following PEMDAS/BODMAS order of operations. See each step with highlighted operations, perfect for learning operator precedence.

Enter numbers separated by commas, spaces, or line breaks to find Q1, Q3, the interquartile range, and all values outside the fences with step-by-step math.

Calculate p-values from test statistics including z-score, t-statistic, chi-square, and F-statistic for one-tailed and two-tailed hypothesis tests.

Find the vertex, focus, directrix, axis of symmetry and latus rectum of any parabola. Supports standard form, vertex form and general conic form, with an interactive graph and step-by-step solutions for each property.

Enter a line equation and a point to get the parallel and perpendicular lines through that point, with a graph and steps.

Graph parametric equations x(t) and y(t) interactively. Features animated curve tracing, speed-based colouring, the osculating circle, tangent vectors, arc length, and presets for Lissajous, heart, rose, butterfly and spirograph curves.

Build Pareto charts that combine ranked bars with a cumulative-percent line so the "vital few" causes behind 80% of any problem jump out instantly. Paste data, pick a threshold, and read the takeaway sentence — no spreadsheet needed.

Compute partial derivatives of multivariable functions with detailed step-by-step solutions, interactive examples, and geometric visualization of tangent planes.

Decompose rational functions into partial fractions with detailed step-by-step solutions, coefficient analysis, and visual decomposition breakdown.

Compute the partition function p(n), the number of ways to write n as a sum of positive integers. Enumerate every partition for small n with Young diagrams, compare distinct-parts and odd-parts counts, and plot the growth curve.

Generate Pascal's triangle up to 30 rows. Explore patterns like Fibonacci numbers, Sierpinski triangle, powers of 2, and binomial coefficients with interactive highlighting and animations.

Calculate percent growth rate with multiple methods: simple growth, compound annual growth rate (CAGR), and average growth rate. Features interactive visualizations, year-by-year analysis, and detailed step-by-step calculations.

Convert percent to decimal instantly with step-by-step calculation, visual diagram, batch conversion for multiple values, and interactive examples. Free online percentage to decimal converter.

Free online percentage calculator with 6 calculation modes: find percentages, calculate percentage of a number, percentage change, difference, increase, and decrease. Features visual charts, step-by-step solutions, and instant results.

Calculate percentage change between two values with step-by-step breakdown, visual comparison charts, and detailed analysis. Find percentage increase, decrease, or difference instantly.

Calculate the percentage decrease between two values with step-by-step solutions, interactive SVG diagrams, and multiple calculation modes including reverse calculations.

Calculate percentage error between estimated and actual values with step-by-step formula breakdown, visual comparison chart, error interpretation, and detailed analysis.

Calculate percentage increase from one number to another with step-by-step solution, visual comparison charts, and instant verification. Perfect for business analytics, academic calculations, and financial analysis.

Calculate the value at any percentile in a dataset, or determine the percentile rank of a specific value. Supports linear, nearest rank, and exclusive interpolation methods with step-by-step breakdown and visualization.

Check if a number is perfect, abundant, or deficient by comparing it to the sum of its proper divisors. View divisor pairs, sigma function values, and an interactive visual breakdown with animated charts.

Calculate permutations P(n,r) with step-by-step solutions, visual explanations, formula breakdown, and practical examples. Find how many ways to arrange r items from n total items where order matters.

Calculate permutations with repetition - ordered arrangements with replacement - using n^r. Enter the number of items and positions for the result, worked steps, slot-machine visuals and examples from passwords, PINs and licence plates.

Calculate the minimum number of items guaranteed to share a container using the pigeonhole principle. Includes interactive visualization, step-by-step proof, generalized analysis, and real-world examples.

Visualize place values from billions to thousandths with an interactive chart. Enter any number to see each digit's place value, expanded form, and word representation.

Check whether a graph is planar - drawable without edge crossings - using Kuratowski's theorem. Detects K5 and K3,3 subdivisions, verifies Euler's inequality, and highlights the forbidden minor when the graph is non-planar.

Calculate the shortest perpendicular distance from a point (x₀, y₀, z₀) to a plane Ax + By + Cz + D = 0. Get step-by-step solution, foot of perpendicular, interactive 3D visualization, and geometric analysis.

Find the equation of a line using point-slope form. Enter a point and slope or two points to get point-slope, slope-intercept, and standard form equations with an interactive graph and step-by-step solution.

Calculate Poisson probabilities P(X=k), cumulative probabilities, and visualize PMF/CDF distributions with detailed step-by-step solutions.

Plot polar equations interactively: r = sin(3t), Archimedean spirals, cardioids, limacons, lemniscates and butterfly curves, with adjustable range, resolution, palettes and grid. Overlay up to three equations and export SVG or PNG.

Convert polar coordinates (r, θ) to Cartesian coordinates (x, y) with up to 1000 decimal places precision. Features interactive visualization, step-by-step solutions, quadrant detection, and verification.

Enter the number of sides to get the diagonal count, the interior-angle sum, and each interior angle of a regular polygon.

Factor polynomials using various methods including GCF, difference of squares, perfect square trinomials, sum/difference of cubes, and quadratic trinomials. Features step-by-step solutions, automatic pattern recognition, and verification.

Divide one polynomial by another using long division. Shows the complete step-by-step process, quotient, and remainder with detailed explanations.

Calculate the roots of polynomial equations up to degree 4 with detailed step-by-step solutions, interactive graph visualization, and root analysis. Supports linear, quadratic, cubic, and quartic equations.

Enter your pool shape, dimensions, and depths to calculate total water volume in gallons or litres, surface area, water weight, and hose fill time.

Calculate population standard deviation (σ) with step-by-step calculations, interactive visualization, variance, mean, and data quality assessment for complete population datasets.

Find the power series representation of a function centred at any point. Compute Taylor and Maclaurin coefficients, determine the radius and interval of convergence with endpoint analysis, and watch partial sums converge.

Enter a whole number up to 10^15 to see its prime factors, a factor tree, and the product in exponential form.

Enter any positive integer with up to 15 digits to get its prime factorization, step-by-step breakdown, and a factor tree visualization.

Enter a positive integer modulus to find all primitive roots, calculate Euler's totient, and view power tables with cyclic group visualizations.

Enter event probabilities to compute conditional probability, intersections, unions, and Bayes' theorem with interactive Venn diagrams and steps.

Calculate probabilities, cumulative distributions (CDF), and quantiles for Normal, Binomial, Poisson, Exponential, Uniform, Chi-Square, and Student's t distributions with step-by-step solutions and interactive visualizations.

Evaluate product (Π) pi notation expressions with step-by-step factor expansion, running product visualization, and growth analysis. Supports polynomial, exponential, trigonometric, and custom expressions.

Solve any proportion a/b = c/d for the missing value with cross multiplication, clear step-by-step solutions, and a visual diagram. Free, instant, and accurate.

Calculate the missing side of any right triangle using a² + b² = c². Get step-by-step solutions, interactive triangle visualization, area, perimeter, and angle calculations.

Decompose any matrix into an orthogonal Q and an upper triangular R with the Gram-Schmidt process. Handles 2x2 to 5x5 matrices with animated step-by-step orthogonalization and a check that Q transpose times Q equals the identity.

Solve quadratic equations using the quadratic formula with step-by-step solutions, discriminant analysis, vertex form conversion, and interactive parabola visualization.

Solve any quartic equation ax⁴+bx³+cx²+dx+e=0 using Ferrari's method. Get all four roots (real and complex), step-by-step solution, discriminant analysis, factored form, and interactive graph.

Calculate quartiles (Q1, Q2, Q3), interquartile range (IQR), detect outliers, and visualize data distribution with interactive box plots and step-by-step calculations.

Calculate the quartile deviation (semi-interquartile range) of a dataset with interactive box plot visualization, complete quartile analysis (Q1, Q2, Q3, IQR), outlier detection, and step-by-step calculation breakdown.

Enter a dividend and a divisor to get the quotient and remainder for whole numbers of any size, with the steps shown.

Convert radians to degrees instantly with interactive unit circle diagram, step-by-step calculation, common angle reference, DMS output, and batch conversion. Free online angle converter for math, physics, and engineering.

Enter an equation with square roots or cube roots to solve it step by step and check for extraneous solutions.

Simplify square roots and higher-order radicals into simplest radical form - sqrt(50) becomes 5*sqrt(2) - including rationalizing the denominator, with step-by-step solutions built on prime factorization.

Determine the radius and interval of convergence for power series using the Ratio Test or Root Test, with step-by-step solutions, convergence visualization, and endpoint analysis.

Generate fresh maths practice by grade level (K-8) and topic: addition, subtraction, multiplication, division, fractions, decimals, percentages, word problems and pre-algebra. Each has a visual aid and a reveal-on-demand solution.

Calculate the range of any dataset instantly with visual spread analysis, step-by-step calculations, quartile breakdown, and interactive data distribution chart.

Solve proportions, simplify ratios to lowest terms, scale ratios up or down, and generate equivalent ratios. Free online ratio calculator with step-by-step solutions and visual ratio bars.

Convert any ratio to percentage with step-by-step solution, visual pie chart representation, and support for multiple ratio formats including fractions and decimals.

Solve rational equations containing fractions with variables in the denominator. Get step-by-step solutions showing LCD calculation, fraction clearing, polynomial solving, and extraneous solution checks with interactive graphs.

Simplify, add, subtract, multiply, or divide rational expressions (fractions involving polynomials). Features step-by-step solutions, factoring visualization, domain analysis, and detailed explanations.

Use the Rational Root Theorem to find every possible rational root of a polynomial with integer coefficients. Enter the coefficients for the full candidate list, verification of the actual roots and step-by-step factoring.

Calculate rectangle area, perimeter, diagonal, inscribed circle, circumscribed circle, and aspect ratio from any two known values. Includes interactive SVG diagram and step-by-step solutions.

Enter a linear homogeneous recurrence with constant coefficients and its initial values. Get the closed form and up to 60 terms.

Simplify any fraction to its lowest terms with interactive visual diagrams, step-by-step prime factorization, and animated GCF calculation. Perfect for students and educators.

Calculate the area, perimeter, apothem, circumradius, interior and exterior angles and number of diagonals of any regular polygon. Enter the number of sides and side length for results with step-by-step formulas and a diagram.

Pick a setup such as a sliding ladder, filling cone, expanding sphere, or balloon, and enter the known rates. Get the related rate with steps.

Approximate definite integrals using Riemann sums with left endpoint, right endpoint, midpoint, trapezoidal, and Simpson's rule. View animated rectangle visualizations, step-by-step solutions, and convergence analysis.

Solve right triangles by entering any two known values (sides or angles). Calculate all missing sides, angles, area, and perimeter with detailed step-by-step explanations and visual diagrams.

Compute addition, subtraction, multiplication, division, inverses and powers in modular rings and Galois finite fields. Visualise Cayley tables, classify units, zero divisors, nilpotents and idempotents, and inspect the group structure.

Compute directly with Roman numerals. Watch every step: subtractive expansion, regrouping, borrowing for subtraction, the Roman doubling method for multiplication and division, and final canonicalization of the answer.

Convert Roman numerals to Arabic numbers and vice versa with detailed visual explanations. Understand the meaning of Roman numeral dates and sequences like "X XXIII XVII" with our interactive step-by-step converter.

Calculate root mean square (RMS) of a set of numbers with step-by-step calculations, interactive visualization, AC/DC signal analysis, and statistical insights.

Round numbers to decimal places, significant figures, or nearest value. Compare 6 rounding methods side by side with visual number line and step-by-step explanations.

Reduce any matrix to reduced row echelon form with detailed step-by-step row operations. Enter your matrix and see every pivot, swap and elimination, then read off rank, nullity, pivot columns, free variables and solution type.

RSD describes spread relative to the mean; it does not establish accuracy or data quality. Judge acceptability using criteria for your method and purpose. A mean near zero can make this ratio unstable.

Enter an equation, initial conditions, and a step size. See each k1-to-k4 step and a solution table, for at most 1000 steps.

Multiply two whole numbers the Russian peasant way: halve the left, double the right, and keep only the odd-left rows. Watch the halving stair build downward and see the parities reveal the binary form of your multiplier.

Calculate the sample mean (arithmetic average) of any dataset with step-by-step visualization, deviation analysis, data distribution chart, and comprehensive statistical insights.

Calculate the required sample size for surveys, research studies, and statistical analysis with confidence level, margin of error, and finite population correction. Get step-by-step formula breakdowns and visual confidence intervals.

Enter sample values. Get the sample standard deviation and variance, plus the mean, median, range, and flagged outliers.

Create beautiful interactive scatter plots to visualize relationships between two variables. Features correlation analysis, trend lines, multiple styling options, and downloadable PNG charts.

A full-featured online scientific calculator with trigonometric, logarithmic, exponential, factorial, and other advanced mathematical functions. Supports degree and radian modes, memory functions, calculation history, and keyboard input.

Convert numbers to scientific notation, perform arithmetic operations (+, -, ×, ÷), compare values, and visualize results with step-by-step explanations and interactive diagrams.

Convert numbers from scientific notation (exponential form) to ordinary decimal notation with step-by-step explanation and visual decimal point movement.

Enter coefficients, forcing expression, initial values, and x range to find the closed-form ODE solution, damping classification, and phase-plane plot.

Calculate seed germination percentage from a germination test, classify seed lot viability, estimate confidence range, and plan how many seeds to sow for a target number of seedlings.

Test whether an infinite series converges using the Ratio, Root, Integral, Comparison, Limit Comparison, Alternating Series and p-Series tests, with step-by-step solutions and animated partial sum graphs.

Perform set operations including Union (A ∪ B), Intersection (A ∩ B), Difference (A − B), Symmetric Difference (A ∆ B), Cartesian Product (A × B), Power Set, and Complement. Visualize with interactive Venn diagrams.

Calculate the area of any polygon from its (x, y) vertex coordinates using the Shoelace (Gauss) algorithm. Supports triangles, quadrilaterals, and complex polygons. Ideal for surveying, GIS, land measurement, and geometry problems.

Evaluate sigma (Σ) summation notation expressions with step-by-step term expansion, running total visualization, and convergence analysis. Supports polynomial, exponential, trigonometric, and custom expressions.

Round numbers to significant figures, count sig figs with digit-by-digit analysis, and perform arithmetic with proper significant figure rules.

Approximate definite integrals with Simpson's 1/3 rule, 3/8 rule and the composite rule. Includes an interactive parabolic visualization, error estimation, convergence analysis, method comparison and step-by-step solutions.

Calculate the sine of any angle with high precision, interactive unit circle visualization, sine wave graph, step-by-step solutions, and special angle recognition. Supports degrees and radians.

Compute derivatives of any single-variable function with step-by-step solutions, differentiation rule identification, interactive graph, and critical point analysis.

Enter a matrix of at most 10 by 10. Get U, Sigma, and V transpose, plus the rank and the condition number.

Enter a mean, sigma, and spec limits, or paste raw measurements. Get Cp, Cpk, Pp, Ppk, sigma level, DPMO, and yield.

Generate skip counting sequences by any number. Visualize patterns on an interactive number line with hop animations, a hundreds chart, and printable sequence lists for classroom use.

Calculate slope, gradient, angle, and line equation from two coordinate points. Features interactive graph visualization, step-by-step solutions, and multiple output formats.

Calculate slope intercept form (y=mx+b) from two points, point and slope, or standard form. Get step-by-step solution with interactive graph visualization.

Set beads or enter an addition, subtraction, multiplication, or division to watch it solved on a 13-column soroban. Whole numbers up to 999,999.

Sort numbers in ascending or descending order with comprehensive statistics, visual distribution charts, and detailed analysis. Handles decimals, negatives, and thousands separators.

Calculate Spearman's rank correlation coefficient (ρ) with step-by-step ranking, tied rank handling, scatter plot visualization, significance testing, and detailed interpretation of monotonic relationships.

Find the standard and general equation of a sphere given center coordinates and radius, or two endpoints of a diameter. Includes step-by-step derivation, 3D visualization, and geometric properties.

Calculate all properties of a square instantly. Enter side length, area, perimeter, or diagonal to find all other measurements with step-by-step formulas and interactive visualization.

Generate list of square numbers (perfect squares), find squares in a range, or check if a number is a perfect square. Interactive visualization with step-by-step calculations.

Calculate the square root of any number with high precision up to 1000 decimals. Features step-by-step explanations, geometric visualizations, and Newton's method demonstration.

Solve the stable marriage problem with the Gale-Shapley algorithm. Paste ranked preference lists for two equal groups to get the guaranteed-stable pairing, with a proposal-by-proposal trace and blocking-pair verification.

Calculate standard deviation, variance, mean, and other statistics with step-by-step solutions and visualizations.

Calculate standard error of the mean (SEM) with step-by-step calculations, confidence intervals, data visualizations, and comprehensive statistical analysis for your dataset.

Convert linear equations from standard form (Ax + By = C) to slope-intercept form (y = mx + b). Enter the equation or coefficients to get instant results with step-by-step solution, graph, and key line properties.

Enter numbers to get count, sum, mean, median, mode, range, variance, standard deviation, geometric and harmonic means, quartiles, and outliers.

Calculate Stirling numbers of the first kind (permutations into cycles) and second kind (set partitions into non-empty subsets). Includes an interactive triangle, a step-by-step recurrence derivation and full triangle tables.

Add long lists of numbers instantly with high precision. Paste or type your values separated by commas, spaces, or line breaks and get the total right away.

Calculate the sum of consecutive cubes from n₁³ to n₂³ with step-by-step formula breakdown, visual cube representation, and mathematical analysis. Perfect for algebra, calculus, and number theory studies.

Calculate the sum of consecutive positive integers using the elegant Gauss summation formula. Features step-by-step calculation breakdown, visual pairing diagrams, and educational insights into arithmetic sequences.

Calculate the sum of consecutive square numbers (1² + 2² + ... + n²) with step-by-step formulas, interactive charts, and visual geometric representations.

Calculate the surface area of 8 geometric shapes including sphere, cylinder, cone, cuboid, rectangular prism, triangular prism, square pyramid, and tetrahedron with detailed step-by-step solutions and interactive diagrams.

Calculate the surface area of a cone instantly with our free calculator. Get lateral surface area, base area, and total surface area with step-by-step formulas and interactive visual diagram.

Enter an edge, space diagonal, face diagonal, or volume to calculate a cube's total surface area.

Calculate the total, lateral, and base surface area of a cylinder with high precision, interactive 3D visualization, step-by-step formula breakdown, and area distribution analysis.

Calculate the surface area of a rectangular prism (cuboid/box) with interactive 3D visualization, step-by-step formulas, face-by-face breakdown, and high-precision results.

Enter the radius or diameter of a sphere to calculate its total surface area with step-by-step formulas and unit conversions.

Evaluate surface integrals of scalar fields and flux integrals of vector fields over parametric surfaces. Choose a preset - sphere, cylinder, cone, paraboloid or torus - or enter your own, with normal vectors and a 3D visualization.

Calculate the surface area of a solid of revolution. Enter any function f(x), set integration bounds and axis of rotation, and get step-by-step solutions with interactive 3D visualizations using the disk and shell surface area formulas.

Divide polynomials by linear binomials (x - a) using the streamlined synthetic division method. Shows step-by-step process with coefficients and remainder.

Enter two or more linear inequalities and the axis window to graph each boundary and shade the overlapping feasible region.

Solve systems of linear equations (2x2, 3x3, or larger) using Gaussian elimination, Cramer's Rule, or matrix methods. Features detailed step-by-step solutions and multiple solution approaches.

Solve systems of two or more nonlinear equations using the Newton-Raphson method. Find all solutions with step-by-step iterations, Jacobian matrix, convergence analysis, and interactive contour graph.

Enter differential equations or matrix coefficients to classify equilibrium points, compute eigenvalues step by step, and generate trajectory phase portraits.

Perform Welch's t-test to determine if there is a statistically significant difference between the means of two independent groups.

Calculate the tangent of any angle with precision from 1 to 1000 decimal places. Supports degrees and radians, shows step-by-step solutions, an interactive unit circle, and clearly flags vertical asymptotes with a special angles table.

Find the tangent line equations from an external point to a circle. Enter the circle equation and a point to get tangent lines, tangent length, contact points, tangent angle, and an interactive diagram with step-by-step solution.

Calculate the Taylor series expansion of any function around a point with step-by-step derivative calculations, interactive comparison graph, and educational explanations.

Compute the tensor product, also called the Kronecker product, of two rectangular matrices with exact fraction arithmetic, block-by-block visualization, copyable results, and SEO-friendly linear algebra explanations.

Practise multiplication tables with a live timer, streak counter and a 12x12 heatmap that pinpoints your weakest facts. Pick any tables from 2 to 12, choose Sprint, Marathon or Boss Battle, and switch between three question formats.

Enter a directed graph to get a topological order with Kahn's algorithm or DFS, or the cycle path if the graph is not acyclic.

Calculate the volume, surface area, and geometric properties of a torus (donut shape). Enter the major radius (R) and minor radius (r) to get instant results with step-by-step formulas and an interactive 3D cross-section diagram.

Enter speeds, gap, head start, and train lengths to solve head-on meetings, overtaking, and platform crossing problems step by step.

Approximate definite integrals with the trapezoidal rule, with an interactive trapezoid visualization, error estimation, Richardson extrapolation, convergence analysis and a per-trapezoid area breakdown. Accepts functions or data points.

Enter city coordinates or a distance matrix to find a tour that visits each city once and returns. Exact Held-Karp up to 12 cities; 2-opt up to 40.

Enter the (x, y) coordinates of three vertices to calculate the triangle's centroid with step-by-step formulas and median diagrams.

Calculate the orthocenter (intersection of the three altitudes) of any triangle given its three vertex coordinates. Get step-by-step solution, altitude equations, triangle classification, and an interactive visual diagram.

Solve trigonometric equations step by step. Enter any trig equation like sin(x)=0.5 or 2cos(x)+1=0 and get all solutions in any interval, with unit circle visualization and interactive graph.

Choose sine, cosine, tangent, cotangent, secant, or cosecant and set A, B, C, and D in y = A*f(B(x-C)) + D to graph the curve.

Enter a known trig value, quadrant, and identity type to calculate sin, cos, tan, csc, sec, and cot with step-by-step solutions up to 100 decimal places.

Compute triple integrals with detailed step-by-step solutions and 3D visualization. Supports definite and indefinite integrals with symbolic computation.

Enter a Boolean expression using letters A through H, eight at most. Get a truth table for AND, OR, NOT, XOR, NAND, NOR, XNOR, and conditionals.

Find every twin prime pair (primes p and p+2) up to any limit you choose. Get the complete list, totals, density per decade, the predicted Hardy-Littlewood count, largest pair found, and an interactive visualization — all in one place.

Calculate unit rate from any ratio. Compare prices per unit, find speed per hour, cost per item, and determine the better deal between two options.

Enter a 2D, 3D, or longer vector, up to 50 dimensions, for its magnitude, unit vector, and direction angles.

Calculate sample variance and population variance with interactive visualization, step-by-step formulas, deviation analysis, and comprehensive statistical insights.

Free online vector calculator with step-by-step solutions. Calculate dot product, cross product, magnitude, unit vector, angle between vectors, projection, and more with interactive 3D visualization.

Calculate the magnitude, or Euclidean norm, of a 2D, 3D or n-dimensional vector. Get a step-by-step computation showing each squared component, the sum under the radical and the final square root, with a vector diagram.

Calculate the vector projection and scalar projection of one vector onto another. Supports 2D and 3D vectors with step-by-step formulas, interactive diagram, and orthogonal decomposition.

Enter whole numbers to multiply, square, or divide with a Vedic sutra. Each step is shown, within that sutra's digit limit.

Generate interactive Venn diagrams for three sets. Enter set elements or region values, customize colors, and download as PNG or SVG. Visualize unions, intersections, and differences instantly.

Calculate the vertex (maximum or minimum point) and the axis of symmetry for any quadratic function (parabola) with detailed step-by-step solutions.

Calculate the volume of 11 different 3D shapes including sphere, cylinder, cone, cube, cuboid, triangular prism, pyramid, tetrahedron, ellipsoid, torus, and frustum. Get instant results with detailed step-by-step solutions.

Enter the radius and height of a cone for its volume, surface area, and slant height, with the formula steps shown.

Enter the edge length for the cube's volume, surface area, and space diagonal, with the formula steps shown.

Calculate the volume and surface area of a cylinder with step-by-step formulas, interactive 3D visualization, unit conversions, and educational diagrams. Supports high-precision calculations.

Calculate the volume of pyramids with rectangular, square, or triangular bases. Features interactive 3D visualization, step-by-step calculations, surface area, and multiple unit support.

Calculate the volume, surface area, and diagonal of a rectangular prism (box) with step-by-step formulas, 3D visualization, and unit conversions. Perfect for construction, packaging, and education.

Calculate the volume of an ellipsoid with step-by-step solution, interactive 3D diagram, surface area estimation, and unit conversions. Supports all common measurement units.

Calculate the volume of a solid of revolution using the disk, washer, and shell methods. Enter your function, bounds, and axis of rotation to get step-by-step solutions with interactive 3D visualizations.

Calculate the volume of a sphere with high precision using radius, diameter, or circumference. Features step-by-step calculations, interactive 3D visualization, unit conversions, and real-world size comparisons.

Calculate Weibull probabilities, reliability, hazard rate and B-life percentiles. Enter the shape and scale parameters to get the PDF, CDF, mean, variance and MTTF, with step-by-step solutions and graphs showing bathtub-curve behaviour.

Solve a combined time, a missing solo time, fill-versus-drain pipes, alternating shifts, or the time when a second worker joins midway.

Calculate the Wronskian determinant of a set of functions to test linear independence. See the full matrix with derivatives, a step-by-step determinant expansion, and a verdict on whether the functions form a fundamental set.

Calculate the x-intercept (where the graph crosses the x-axis) and y-intercept (where the graph crosses the y-axis) of any equation with detailed step-by-step solutions.

Calculate z-scores (standard scores) instantly with step-by-step formulas, interactive normal distribution visualization, probability lookup, percentile ranking, and statistical interpretation.

Compute one-sided Z-transforms and causal inverse Z-transforms. Enter a sequence formula, finite sample list, or rational X(z) to get the transform, ROC, poles and zeros, sample table, and visual z-plane analysis.

Enter labels and one or more series, up to 200 points. Make a line chart with curves, area fill, or markers, then download PNG or SVG.

Enter labels and values, up to 50 bars, and choose a direction and color theme to download a PNG or SVG.

Enter labels and values, up to 20 slices, to draw a pie or donut chart and download it as PNG or SVG.

Enter property values, debt, and exchange details to estimate deferred gain, taxable boot, and your 45-day and 180-day identification deadlines.

Enter contractor income and deductions to see self-employment tax, federal and state tax, quarterly payments, and take-home pay.

Project your 401(k) retirement savings growth with employer matching contributions, salary increases, and investment returns. Visualize year-by-year balance growth and see how contribution changes impact your retirement nest egg.

Enter your 529 balance, monthly contribution, expected return, and today's tuition to see projected savings versus the inflated bill.

Calculate the acid test ratio (quick ratio) to assess if your business has enough liquid assets to cover immediate liabilities. Get instant financial health assessment, visual gauges, and detailed analysis.

Calculate the actual cash value (ACV) of your property for insurance claims. Includes depreciation analysis, multiple calculation methods, visual breakdown charts, and year-by-year value tracking.

Enter operating cost, demand, season, occupancy target, and cleaning fee to get nightly rates, projected revenue, and RevPAN.

Estimate spousal support (alimony) payments based on both spouses' incomes, marriage duration, and lifestyle factors. Compare AAML formula and income-percentage methods side by side.

Enter price, cost, dimensions, and weight to estimate referral and fulfillment fees, profit, margin, ROI, and break-even price.

Calculate monthly mortgage payments, view amortization schedules, and see principal vs interest breakdown with interactive charts.

Work out annuity payouts and the depletion timeline for a self-managed retirement account. Solve for how long the money lasts, the safe monthly withdrawal, or the principal needed, with inflation-adjusted values and a yearly table.

Calculate the true Annual Percentage Rate (APR) of your loan including all fees. See monthly payments, total interest, cost breakdown, and amortization schedule with interactive visualization.

Convert APR to APY with interactive compounding frequency comparisons, step-by-step calculations, and growth projections. Understand the true impact of compound interest on your savings and investments.

Enter a nominal interest rate and how often it compounds to get APY and, optionally, growth of a starting deposit.

Convert APY (Annual Percentage Yield) to APR (Annual Percentage Rate) with visual comparison, step-by-step calculation breakdown, and comprehensive analysis of how compounding frequency affects your actual interest rate.

Model a 5/1, 7/1, 3/1 or 10/1 adjustable-rate mortgage before and after the rate adjusts. Enter the loan, initial rate and the initial, periodic and lifetime caps to see payment shock, a worst-case trajectory and a fixed-rate comparison.

Calculate auto loan payments, total interest, and generate a detailed amortization schedule with interactive charts.

Enter net credit sales, average accounts receivable, and days in the period to get the collection period and turnover.

Work out the lower monthly payments during a balloon loan term and the large final payment due at maturity. See a payment timeline, a comparison against a fully amortized loan, and how much principal is left as the balloon.

Enter amount invested, BTC purchase price, and a target price. Get projected value, ROI, CAGR, and a comparison with the S&P 500 and gold.

Compare biweekly mortgage payments with standard monthly ones and see how much faster you pay off the home and how much interest you save. Twenty-six half-payments equal 13 monthly ones, so you make one extra payment a year.

Calculate the theoretical fair value of European call and put options using the Black-Scholes model. Includes Delta, Gamma, Theta, Vega, Rho calculations with interactive payoff diagrams and sensitivity analysis.

Calculate the monthly payment, total interest and total cost of financing a boat, allowing for your down payment, trade-in and sales tax. Includes a balance curve, principal-versus-interest split and a year-by-year schedule.

Enter price, coupon, yield, and maturity. Compare a duration-only price change with one that also uses convexity.

Compute Macaulay duration, modified duration, DV01, and PV half-life for any coupon bond. See duration as a balance-point of present-value cash flows, predict the price change for a custom yield shock, and walk through every formula step.

Enter face value, purchase price, and days to maturity. Get bond equivalent yield for a discount security.

Calculate bond yields including Current Yield, Yield to Maturity (YTM), and Yield to Call (YTC) with step-by-step formulas, cash flow analysis, and interactive visualization.

Enter current bond price, par value, annual coupon rate, and years to maturity to calculate yield to maturity along with expected capital gain or loss.

Calculate your bonus amount, estimate tax withholding, see total compensation breakdown with visual charts, and understand your take-home pay.

Calculate book value per share (BVPS) with visual equity breakdown, step-by-step formulas, Price-to-Book ratio analysis, and investment valuation insights for fundamental stock analysis.

Enter fixed costs, selling price per unit, and variable costs to calculate your break-even units, break-even revenue, and sales for a target profit.

Analyse a BRRRR real estate deal end to end. Enter purchase price, rehab budget, holding costs, ARV, refinance terms and rent to see all-in cost, equity created, cash recovered, cash left in the deal, cash flow and cash-on-cash return.

Allocate your income using the 50/30/20 budgeting rule. Get a visual breakdown of needs, wants, and savings with customizable categories, monthly planning, and actionable spending insights.

Estimate monthly payments, total interest, and amortization schedules for small business loans. Compare loan scenarios with origination fees, extra payments, and interactive charts to find the best financing option.

Estimate the market value of a business using revenue multiples, EBITDA multiples, and earnings-based P/E valuation. Compare all methods side-by-side with industry benchmarks, valuation range, and smart insights.

Calculate the compound annual growth rate, visualize investment growth, and understand year-over-year returns with detailed analysis.

Calculate capital employed using multiple methods with visual breakdown, step-by-step calculations, ROCE analysis, and interactive balance sheet diagram.

Calculate federal taxes on investment profits from stocks, real estate, or crypto. Compare short-term vs long-term capital gains rates, see NIIT impact, and get personalized tax-saving strategies for 2024 tax year.

Calculate capital gains yield (CGY), dividend yield, total return, and annualized performance with step-by-step formulas, interactive charts, and investment analysis.

Enter two of net operating income, property value, and cap rate. Get the missing figure for an income-approach check.

Calculate expected return, risk-free rate, beta, or market return using the Capital Asset Pricing Model (CAPM). Features step-by-step calculation, Security Market Line visualization, and investment risk analysis.

Find out how much car you can afford from your income, down payment and loan rate using the 20/4/10 rule. See your maximum car price, monthly payment, total interest and an instant pass/fail check for any car you are considering.

Calculate how much your car will depreciate over time. Get year-by-year value estimates, interactive charts, and detailed depreciation schedules based on purchase price and depreciation rate.

Calculate monthly car lease payments from vehicle price, residual value, money factor, lease term, down payment, taxes, and fees with a clear depreciation and finance charge breakdown.

Calculate how long it will take to pay off your car loan, compare standard vs accelerated payoff strategies, see total interest savings, and view a detailed month-by-month amortization schedule.

Calculate cash flow margin with step-by-step formula breakdown, industry benchmarks, visual analysis, and actionable insights for financial health assessment.

Enter cash, marketable securities, and current liabilities to calculate your cash ratio, check liquidity benchmarks, and assess short-term solvency.

Enter price, down payment, closing costs, rehab, loan terms, and rent. Get cash-on-cash return, NOI, cash flow, and DSCR.

Build a CD ladder and see your blended APY, the value and maturity date of every rung, and when cash frees up. A staircase diagram and rollover simulation show the steady-state yield once every rung renews at the top rate.

Calculate CD interest earned, ending balance, APY, year-by-year growth, early withdrawal penalty, and tax-adjusted returns with interactive charts and step-by-step formulas.

Estimate child support payments based on both parents' incomes, number of children, custody arrangement, and additional expenses using the Income Shares Model used by most US states.

Calculate customer churn from the customers you started with and the number lost. Get correctly compounded annualised churn, customer lifetime, retention rate, revenue churn, net churn and a 12-period survival curve.

Estimate total closing costs when buying or refinancing a home. Get a detailed breakdown of lender fees, title charges, government taxes, and prepaid items with smart savings tips.

Enter cup price, cups per day, and a home-brew cost. Get daily to yearly spend and what brewing at home would save.

Estimate the full cost of a college education before your child enrols. Projects tuition and fees, room and board, and books forward year by year with college inflation, and shows the monthly savings needed to fund it.

Calculate sales commission instantly with flat, tiered, and bonus commission structures. Features interactive pie charts, step-by-step breakdowns, and support for real estate, insurance, and sales commissions.

Calculate and visualize the exponential growth of a trading account with daily compound interest. See how reinvesting daily percentage gains can dramatically grow a small account over time.

Calculate compound interest with detailed year-by-year breakdown, interactive growth charts, and comprehensive investment analysis including effective annual rate and growth projections.

Enter initial balance, interest rate, regular contributions, and inflation rate to calculate future savings with year-by-year milestones.

Enter build amount, down payment, rates, and months. Compare even, front-loaded, and back-loaded draws, then the finished-home payment.

Calculate continuous compounding interest and future value with step-by-step formulas, growth visualization, and comparison charts. Understand the power of Euler's number (e) in financial calculations.

Calculate unit and total contribution margin, the contribution margin ratio and break-even point from price, variable cost, volume and fixed costs. Includes a cost-volume-profit chart, margin of safety and operating leverage.

Calculate cost of equity using Dividend Discount Model (DDM) and Capital Asset Pricing Model (CAPM) with step-by-step formulas, sensitivity analysis, and professional interpretation.

Estimate the total cost of raising a child from birth to 18, year by year and by category - housing, food, childcare, healthcare, transport and clothing. Adjust for income, number of children, inflation and optional college.

Enter total ad spend, leads, clicks, and deal value to calculate cost per lead, cost per click, customer acquisition cost, conversion rate, and overall ROI.

Work out the true cost per mile of driving from fuel, insurance, depreciation, maintenance, registration and finance charges. Compare it with the IRS standard mileage rate and see how the cost falls as annual mileage rises.

Price handmade products properly. Enter materials cost, labour hours, hourly wage and overhead to get a recommended wholesale and retail price, profit per item and the effective hourly wage you really earn at each price.

Calculate your credit card payoff timeline, total interest cost, and compare payment strategies. Visualize how minimum payments extend your debt and discover how much you can save by paying more.

Calculate your credit card payment, total interest, and view a complete amortization schedule with interactive visualizations.

Enter your credit card balance, APR, and fixed monthly payment to determine your exact payoff date, total interest, and amortization schedule.

Enter each card's balance and credit limit to calculate individual and total utilization, plus the paydown needed to reach 30% and 10% thresholds.

Enter buy price, sell price, amount, trading fees, withdrawal fee and network cost to see if a buy on one exchange and a sell on another still profits.

Calculate your leveraged crypto futures position size, potential profit/loss, ROI, and liquidation price. Visualize risk with interactive charts for Bitcoin, Ethereum, and other cryptocurrencies.

Calculate exact profit or loss from any cryptocurrency trade. Enter buy price, sell price, quantity, and fees to instantly see your net gain/loss, ROI, break-even price, and more.

Convert between 40+ world currencies with live exchange rates. Features instant real-time conversion as you type, animated currency swap, multi-currency comparison grid, and detailed rate information. Fast, accurate, and mobile-friendly.

Calculate the current ratio to measure short-term liquidity. Includes visual ratio gauge, asset vs liability breakdown, industry benchmarks, and comprehensive financial health analysis.

Enter paid-media, sales, content and tool spend, plus customers acquired, to get blended CAC, the LTV-to-CAC ratio and payback period.

Enter retention, ARPU, gross margin and discount rate to get simple and discounted CLV, expected lifespan, payback and a yearly revenue waterfall.

List each debt and the new loan's rate and term to compare monthly payment, total interest and time to payoff. Maximum 20 debts.

Enter operating income and debt service to calculate your Debt Service Coverage Ratio, compare lender benchmarks, or solve for required NOI.

Create debt payoff plans using the snowball or avalanche method. Compare strategies side-by-side, see monthly schedules, total interest saved, and visualize your path to debt freedom.

Enter total debt and total assets to get the debt-to-asset ratio, the formula steps and a health reading against industry benchmarks.

Calculate debt to equity ratio (D/E) with step-by-step breakdown, visual gauge, industry benchmarks comparison, risk assessment, and financial leverage analysis for informed investment decisions.

Calculate your debt-to-income ratio with itemized debt categories, visual DTI gauge, mortgage qualification tiers, step-by-step formula, and actionable improvement tips.

Calculate debtor days (DSO) to measure how many days it takes to collect payment from customers. Includes step-by-step formula breakdown, performance benchmarks, and cash flow analysis.

Build a depreciation schedule using straight-line, declining balance (200% or 150%) or sum-of-years digits. See yearly expense, accumulated depreciation and book value, compare all three methods, and set a first-year convention.

Enter the original price and one or two discounts, including a buy-and-get offer, to see the savings, sale price and price after tax.

Enter a discount rate, number of periods, and optional future value to calculate present value discount factors with up to 100 decimal places.

Calculate intrinsic stock value using the Dividend Discount Model (DDM) with Gordon Growth, Two-Stage, and H-Model variations. Features step-by-step calculations, dividend projections, and sensitivity analysis.

Enter total dividends and net income, or dividend per share and earnings per share, to get the payout ratio, retention ratio and a sustainability note.

Enter starting amount, price, yield, years, growth and extra contributions to project a portfolio with dividends reinvested and compare not reinvesting.

Enter annual dividend per share, stock price, and optional shares owned to calculate dividend yield and estimate your total dividend income.

Enter the amount, frequency, years and expected return, plus an optional lump sum, to compare dollar-cost averaging with investing the money at once.

Enter dollars and a live or manual spot price to get gold weight in troy ounces, grams, tola and tael, adjusted for karat and premium, plus coin or bar sizes.

Calculate how long it takes for an investment or value to double at a constant growth rate. Features Rule of 72 comparison, multiple growth milestones, and interactive visualizations.

Calculate your required down payment and see how different down payment amounts affect monthly mortgage payments, PMI costs, and total interest over the life of the loan.

Enter net income, preferred dividends, and share counts to calculate basic, diluted, and weighted average earnings per share with step-by-step analysis.

Enter sale price, category, item cost and shipping to see final value and per-order fees, ad cost, net profit and the price for a target margin.

Calculate EBIT (Earnings Before Interest and Taxes) with visual income statement breakdown, waterfall chart visualization, EBIT margin calculation, and step-by-step formulas.

Enter EBIT and net revenue to determine your operating profit margin, view industry benchmarks, and get step-by-step formula steps.

Calculate EBITDA using two methods (Net Income or Operating Income approach) with step-by-step formulas, EBITDA margin analysis, interactive breakdown charts, and industry benchmarks.

Enter EBITDA and revenue, or build EBITDA from net income, interest, taxes and D&A, to get the margin versus an industry or custom benchmark.

Calculate the effective annual interest rate (EAR/APY) from a nominal rate and see how different compounding frequencies affect your returns or costs.

Calculate effective annual yield (APY) from nominal interest rate with step-by-step formulas, compounding frequency comparison, growth visualization, and investment analysis.

Enter hash rate, watts, electricity price and Bitcoin price to see profit or loss, break-even power price and daily, monthly and yearly figures.

Enter emails sent, open, click and conversion rates, order value and cost to get ROI, ROAS, revenue per email and the stage that limits the funnel.

Enter monthly expenses, employment type and dependents to get a target emergency fund, savings milestones and a timeline to reach it.

Enter loan amount, interest rate and tenure to get the monthly installment, total interest and an amortization schedule. Tenure can run to 600 months.

Calculate the true total cost of hiring, including gross salary, payroll taxes (Social Security, Medicare, FUTA, SUTA), benefits, insurance, PTO, equipment, training and every other employer overhead, so you know what each hire costs.

Enter annual demand, ordering cost, and holding cost to find the optimal order quantity, reorder point, and minimum total cost.

Project your Employees Provident Fund corpus from monthly basic salary, employee and employer contributions, increments and interest. Splits the employer 12% into EPF and the capped EPS pension share and credits interest at year-end.

Enter total assets and shareholders' equity to determine your equity multiplier, debt ratio, and DuPont component values.

Enter shareholders' equity and total assets to get the equity ratio, debt ratio and debt-to-equity ratio, next to an industry benchmark.

Enter paycheck contributions, the discount and lookback details to model shares bought, discount value, tax and returns under different sale scenarios.

Enter gross estate value and deductions to estimate federal estate tax, with a bracket breakdown and the effective tax rate.

Enter price, product cost and shipping to total listing, transaction, payment and offsite-ad fees, then see profit, break-even and a target-margin price.

Calculate monthly payments, upfront and annual mortgage insurance premiums (MIP), and total costs for FHA-insured home loans. Compare FHA vs. conventional financing side-by-side.

Calculate Fibonacci extension levels (61.8%, 100%, 127.2%, 161.8%, 200%, 261.8%, 423.6%) for profit targets using 3-point ABC wave analysis. Interactive wave visualization, step-by-step formulas, and one-click copy for trading.

Enter a start price and an end price to calculate Fibonacci retracement and extension levels from 23.6% through 161.8%.

Enter purchase batches and units sold to compare cost of goods sold, ending inventory, and gross profit, and see the LIFO reserve.

Calculate the exact date you can achieve financial independence and retire early. Based on your savings rate, monthly expenses, current savings, and expected investment returns. Compare Lean, Regular, and Fat FIRE strategies side by side.

Calculate fixed asset turnover ratio with interactive visualization, industry benchmarks, step-by-step formulas, and efficiency analysis to measure how well your business generates revenue from fixed assets.

Calculate the Fixed Charge Coverage Ratio (FCCR) with step-by-step formulas, visual gauge analysis, financial health assessment, and comprehensive breakdown of a company's ability to cover fixed obligations.

Calculate fixed deposit maturity amount, interest earned, and compare different compounding frequencies with interactive growth charts and year-by-year breakdown.

Enter your premium, term, cap rate, participation rate, and floor to project indexed annuity returns and compare them with a fixed annuity or direct index.

Compute implied forward rates from a spot rate term structure. Paste any yield curve to get the full forward rate matrix, the 1-period forward curve over the spot curve, a curve-shape diagnosis and a no-arbitrage walkthrough.

Price a freelance project from your estimated hours, hourly rate, overhead and profit margin. See the price build up from labour, overhead, expenses and profit, your effective hourly rate, and the margin and markup behind the quote.

Calculate trip fuel costs instantly. Enter distance, fuel efficiency (MPG or L/100km), and gas price to get total cost, gallons needed, cost per mile, and a detailed trip breakdown with visual fuel gauge.

Calculate the future value of investments with compound interest, optional periodic contributions, step-by-step formulas, interactive growth chart, and year-by-year breakdown table.

Calculate the Future Value Interest Factor (FVIF) to determine how much $1 invested today will grow. Features interactive growth charts, period-by-period breakdown, and doubling time analysis.

Calculate the future value of an annuity with step-by-step formulas, growth visualization, payment schedule breakdown, and comparison between ordinary annuity and annuity due.

Calculate the future value of annuity due (FVAD) with step-by-step formulas, payment schedule breakdown, investment growth visualization, and comparison with ordinary annuity.

Calculate the future value of a growing annuity (FVGA) with step-by-step formulas, interactive growth visualization, detailed payment schedule, and financial analysis.

Enter present value, interest rate, and time periods to calculate the future value of your lump sum investment with a year-by-year growth breakdown.

Calculate the Future Value Interest Factor of Annuity (FVIFA) with high precision, step-by-step formula breakdown, interactive visualization, payment schedule, and comprehensive FVIFA tables for financial planning.

Enter the bill, tax, tip percentage, and gift-card balance to see what the card pays, the cash still due, and any balance left.

Calculate the goodwill to assets ratio with step-by-step formula breakdown, risk assessment, industry benchmarks, and visual gauge. Evaluate acquisition strategy and intangible asset exposure.

Enter your last drawn salary and years of service to calculate your gratuity payout under the 15/26 formula and view your tax exemption split.

Calculate gross profit margin, gross profit, and markup percentage with interactive visualizations and detailed financial analysis for business profitability assessment.

Enter a property price and gross rent to calculate the gross rent multiplier and a fair-value estimate for comparison.

Work out the gross pay needed to deliver a specific take-home amount after taxes. Enter the net you want and a combined rate, or itemize federal, state, local, Social Security and Medicare, and see the gross-up cost and multiplier.

Compare the long-term cost of a gym membership against building a home workout setup. See the exact break-even month, the total cost of each option over time on a crossover chart, your cost per workout and a clear verdict.

Enter home value, mortgage balance, line amount, and rate to compare draw and repayment payments. Combined loan-to-value is capped at 85%.

Enter beginning and ending investment values, received income, and holding period in years to calculate total HPR and annualized returns.

Calculate how much house you can afford based on your income, debts, down payment, and mortgage details. Get a complete affordability analysis with monthly payment breakdown, DTI ratios, and visual charts.

Calculate your home equity from current market value and mortgage balance. See your equity percentage, LTV ratio, track milestones like PMI removal, and project future equity growth with appreciation estimates.

Calculate the freelancer hourly rate you need from your target annual income, taxes, expenses, billable hours, time off, and profit buffer.

Enter purchase price, repairs, and sale price. See total costs, net profit, ROI, cash-on-cash return, and the 70% Rule maximum purchase price.

Enter purchase price and date, current price and date, and a future date. See the appreciation rate and a future home value.

Enter basic salary, DA, HRA received, rent paid, and city type. See exempt and taxable HRA and which of the three limits applies.

Enter your age, contributions, employer match, and return rate to check IRS annual limits and project your HSA balance against a taxable account.

Calculate the composite rate, semiannual interest accrual and 3-month early-redemption penalty for US Series I savings bonds. See the bond grow month by month, what you forfeit before 5 years, and your penalty-adjusted real yield.

Enter the premium and the term. See the periodic payment, a payment schedule, and how each payment splits between principal and interest.

Calculate impermanent loss when providing liquidity to AMM pools. Compare LP returns vs HODL strategy with interactive visualizations and real-time analysis for Uniswap, PancakeSwap, and other DEXs.

Calculate implied volatility from option prices using the Black-Scholes model. Features Newton-Raphson iteration, IV surface visualization, Greeks analysis, and comprehensive market interpretation tools.

Enter your gross income, filing status, and pretax deductions to compute your estimated 2025 federal and state taxes and net take-home pay.

Calculate Interest Coverage Ratio (ICR) and Times Interest Earned (TIE) with visual gauge, financial health assessment, industry benchmarks, step-by-step calculation breakdown, and risk analysis for debt coverage evaluation.

Calculate the actual annual interest rate (APR) of a loan from the loan amount, term, and monthly payment. Includes step-by-step formula breakdown, full amortization schedule, and interactive payment visualization chart.

Compare your monthly payment during the interest-only period with the fully amortizing period. See how far the payment jumps when the interest-only term ends, the principal still owed, and how total interest compares with a standard loan.

Calculate inventory period (days in inventory) with step-by-step formulas, industry benchmarks, visual analytics, and inventory management insights for business optimization.

Calculate inventory turnover ratio, days sales in inventory (DSI), and compare with industry benchmarks. Features step-by-step formulas, efficiency ratings, and actionable business insights.

Calculate investment returns with compound interest, regular contributions, inflation adjustment, and tax impact. Visualize growth with interactive charts and year-by-year breakdown.

Enter the amount due, days overdue, interest or a flat fee, a grace period, and any cap. See the late fee and the total due.

Calculate the Internal Rate of Return (IRR) for investments with variable cash flows, visual timeline, NPV sensitivity analysis, and step-by-step calculation breakdown.

Calculate the optimal percentage of your capital to bet or invest using the Kelly Criterion formula. Features interactive visualization, fractional Kelly options, risk analysis, and step-by-step calculations for traders and bettors.

Enter price, down payment, rate, and term. See the monthly payment, total interest, total cost, and an optional balloon date.

Find out whether buying your leased car at lease end is a good deal. Adds the residual price, purchase-option fee and sales tax for a true out-the-door cost, then compares it with market value to show your instant equity and a verdict.

Compare the true total cost of leasing versus buying a car, truck, or equipment. Includes break-even analysis, opportunity cost on your down payment, hidden fees, and rollover-aware horizon for honest side-by-side numbers.

Enter lemon, sugar, cup, and ice costs, cups per batch, sale price, and cups sold per day. See break-even, margin, and daily to monthly profit.

Compare up to four loans side by side on monthly payment, true APR, total interest and total cost. Upfront fees and points are folded into the APR, and three separate winners are highlighted because they often disagree.

Enter balance, payment, and rate. See how long payoff takes, total interest, the amortization schedule, and the effect of extra payments.

Calculate loan to deposit ratio (LDR) with visual analysis, liquidity health assessment, regulatory benchmarks, and step-by-step calculations for banking financial analysis.

Work out the yearly difference between buying lunch out and packing it from home. See a daily, weekly, monthly and yearly breakdown plus an invest-the-difference projection of what those savings become over 5, 10, 20 and 30 years.

Calculate the exact liquidation price for your leveraged trading position. Visualize risk zones, understand margin requirements, and protect your investments from forced liquidation.

Enter two of cost, selling price, and markup percentage. Get the missing figure and the profit on that price.

Simulate Martingale and Anti-Martingale strategies for trading and betting. Understand capital requirements, risk of ruin, position sizing implications, and expected outcomes with Monte Carlo simulations.

Enter trip miles, labels, and IRS or custom rates to calculate total reimbursement for business, medical, charity, or moving travel.

Enter your loan amount, down payment, interest rate, tax, and insurance to view your monthly mortgage payment and complete amortization schedule.

Calculate your mortgage payment with full amortization schedule, principal vs. interest breakdown, interactive charts, affordability analysis, and year-by-year payment timeline.

Compare up to four mortgage offers side by side with monthly payments, total interest, amortization breakdowns, and interactive charts to find your best deal.

Enter the balance, rate, term, and an extra payment. See how the extra amount shortens the term and how much interest it removes.

Compare paying mortgage discount points upfront with keeping your cash. Shows the lower rate and payment, the upfront cost, and a break-even analysis that also models what your cash could earn if invested instead.

Calculate the new monthly principal-and-interest payment after a lump-sum recast. Compares recast, prepay-only and refinance side by side, and shows break-even on the recast fee, total interest saved and a re-amortization timeline.

Enter the current balance and rate, the new rate, and closing costs. Get the payment change, interest saved, and the months to break even.

Enter price, down payment, trade-in, sales tax, APR, and term. Get the payment, total interest, and when the balance falls below the bike's value.

Enter your rooms and packing style. Get counts for small through extra-large boxes, wardrobe and dish packs, a supplies list, packing time, and a truck size.

Project mutual fund investment growth accounting for expense ratios, front-end loads, and annual contributions. Visualize the true cost of fees on your long-term wealth and compare fee scenarios side by side.

Calculate net profit margin with visual profit breakdown, industry benchmarking, step-by-step formulas, and profitability health assessment for business analysis.

Enter asset and liability amounts by category. Get net worth, a chart of the mix, a financial health score, and milestone tracking.

Enter an effective annual rate (up to 1,000%) and compounding frequency to calculate the nominal annual interest rate (APR) with step-by-step formulas.

Enter promoter, passive, and detractor counts. Get the Net Promoter Score, a 95% confidence interval, a tier, and industry benchmarks.

Calculate your National Pension System maturity corpus, the tax-free lump sum and the monthly pension you can expect. Watch your wealth grow year by year and use the annuity-versus-lump-sum slider to find the split that suits you.

Calculate Net Present Value (NPV), Internal Rate of Return (IRR), Profitability Index, and Payback Period with step-by-step formulas, cash flow visualization, and investment decision analysis.

Enter operating profit and revenue for one period or several. Get the operating margin, a health reading, industry benchmarks, and the trend.

Calculate operating profit percentage (operating margin) with step-by-step formula breakdown, profit waterfall visualization, industry benchmarks, and financial analysis insights.

Calculate and visualize the Option Greeks (Delta, Gamma, Theta, Vega, Rho) to understand option price sensitivity to underlying price, time decay, volatility, and interest rates. Features interactive sensitivity charts and trading insights.

Estimate probability of profit for long calls, puts, spreads, covered calls, strangles, and iron condors using implied volatility and expiration break-even prices.

Calculate and visualize the profit/loss potential of Long Call and Long Put option strategies at expiration with interactive payoff diagrams and comprehensive risk analysis.

Enter vehicle price, taxes, doc fees, trade-in value, and rebates to calculate your total out-the-door cost and estimate loan payments.

Calculate your total weekly earnings including overtime pay with visual breakdown, step-by-step calculations, and annual projections.

Calculate the Price-to-Earnings (P/E) ratio with valuation analysis, sector benchmarks, earnings yield, and investment insights. Free online P/E ratio calculator with step-by-step calculations.

Enter total claims, independent claims, and page counts to estimate and compare official patent filing, search, and examination fees across patent offices.

Calculate simple and discounted payback periods for investments with year-by-year cash flow analysis, interactive visualization, and break-even timeline.

Estimate your net take-home pay per paycheck after federal and state income tax, Social Security, Medicare and pre-tax deductions like 401(k) and health insurance. Uses 2026 brackets and supports every common pay frequency.

Calculate PayPal fees on any payment and see exactly what you keep. Reverse mode finds how much to invoice so you net a target amount, avoiding the gross-up trap. Rates are editable and multiple currencies are supported.

Enter salary, years of service, and the benefit multiplier to estimate the pension, an early-retirement cut, and COLA-adjusted income.

Calculate the total per-diem allowance for a business trip from your lodging rate, M&IE rate and number of days. Applies the GSA rule that lodging is never prorated while first and last travel days get only 75% of the M&IE rate.

Calculate the sale price and exactly how much you save with any percent-off discount. Enter the original price and discount percentage to see the final price instantly.

Calculate monthly payments, total interest, and view a detailed amortization schedule for personal loans. Compare scenarios with extra payments, see payoff milestones, and get smart insights to save money.

Calculate the value of a single pip in your account currency for any forex currency pair with live exchange rates. Essential for forex position sizing, risk management, and trade planning.

Enter high, low, and close to get pivot, support, and resistance levels by Standard, Fibonacci, Woodie, Camarilla, or DeMark.

Compare two pizzas by size and price to find the best deal. Uses the area formula (pi times r squared) to calculate the price per square inch for each option, so you always get the most pizza for your money.

Estimate your monthly private mortgage insurance cost and find out when you can drop it. Walks the amortization month by month to show the 80% LTV cancellation date, the 78% automatic termination date and your total PMI cost.

Calculate optimal position size for trading with advanced risk management. Features include long/short position support, risk-reward ratio analysis, interactive charts, and comprehensive position breakdown for stocks, forex, and crypto.

Calculate your Public Provident Fund maturity value, total interest and year-by-year passbook at the current 7.1% rate. See the rupee advantage of depositing before the 5th, the EEE tax-free benefit and 5-year extension projections.

Calculate the present value of annuity due (PVAD) with step-by-step formulas, payment schedule, timeline visualization, and comparison with ordinary annuity.

Calculate the present value of future cash flows including lump sums, ordinary annuities, annuities due, growing annuities, and perpetuities. Features step-by-step formulas, interactive timeline visualization, and investment analysis.

Calculate the present value of ordinary and annuity due with interactive payment timeline, detailed breakdown tables, and comprehensive financial analysis including PVIFA factors.

Calculate the present value of a growing annuity (PVGA) with step-by-step formulas, interactive cash flow timeline visualization, and detailed payment schedule analysis.

Enter a future lump sum, a discount rate, and the time to get its present value at the compounding frequency you pick.

Calculate the price to book ratio (P/B ratio) to assess stock valuation and compare market price to book value per share.

Work out the true cost per page of printing, ink or toner plus paper, so you can compare printers or budget a job. Enter cartridge price, page yield, paper cost and page count for the per-page cost and your monthly and yearly spend.

Calculate gross profit, profit margin, and markup percentage from revenue and cost. Features multiple calculation modes, interactive charts, step-by-step formulas, and margin vs markup comparison.

Calculate profit to sales ratio (net profit margin) with step-by-step breakdown, industry benchmark comparison, profitability rating, and actionable business insights.

Calculate your annual and monthly property taxes based on home value, assessment ratio, tax rate, and exemptions. See tax breakdowns by category, 10-year projections, and compare with U.S. averages.

Enter monthly rent and a move-in or move-out date to compare partial-month rent by actual days, a 30-day month, and a 365-day year.

Calculate the Present Value Interest Factor (PVIF) with interactive visualizations, step-by-step calculations, and comprehensive time value of money analysis. Features customizable precision up to 1000 digits.

Calculate the present value interest factor of annuity (PVIFA) with interactive visualization, period-by-period breakdown, and practical annuity valuation examples.

Calculate quick ratio (acid test ratio) with step-by-step analysis, liquidity assessment, component breakdown visualization, and industry benchmark comparison.

Calculate the maturity value of a Recurring Deposit using the monthly-balance, quarterly-compounding method banks actually use. See the maturity amount, total interest, a quarter-by-quarter ledger and the gain over simple interest.

Enter the sale price and a commission rate. See the dollar fee, the split between buyer and seller agents, and the seller's net.

Discover what you actually earn per hour after deducting commute costs, work clothes, unpaid overtime, decompression time, and other hidden work expenses from your salary. Based on the Your Money or Your Life methodology.

Enter a nominal return, an inflation rate, and an optional starting amount. Get the inflation-adjusted return and the purchasing-power effect.

Calculate receivables turnover ratio, days sales outstanding (DSO), and collection period with step-by-step formulas, interactive visualization, industry benchmarks, and financial health assessment.

Enter your fuel or transit fare, parking, dining, and coffee expenses to see your weekly, monthly, and yearly savings along with commute time avoided.

Find out how much rent you can afford using the 30% rule, the debt-aware 36% back-end rule and the 50/30/20 framework. Get conservative, recommended and stretch budgets, and check whether a specific apartment fits.

Calculate a rent increase as a percentage and an amount, including the annualized rate when it spans more or fewer than 12 months. Compare it with inflation and rent-control benchmarks and project your rent forward five years.

Enter home price, down payment, mortgage rates, and current rent to compare total lifetime costs, opportunity costs, and determine your breakeven timeline.

Enter purchase price, down payment, loan terms, and expected rent to calculate cash flow, cap rate, cash-on-cash return, and an overall deal score.

Calculate gross and net rental yield on an investment property from purchase price, rent and operating expenses. See both on a dual-pointer gauge, watch how expenses eat the return, and get the price-to-rent ratio and payback period.

Calculate your reorder point from average demand, lead time and safety stock so each order lands as stock runs low. Choose a fixed buffer or a statistical service-level mode driven by demand and lead-time variability.

Enter the starting cohort size and active users at day 1, 7, and 30, or your own periods. Get retention, drop-off, and cohort half-life.

Enter net income and dividends paid. Get the plowback ratio and how earnings split between dividends and reinvestment.

Find out whether your retirement savings will last, with year-by-year projections, a Monte Carlo success probability, withdrawal strategy comparison, Social Security integration and inflation-adjusted spending analysis.

Enter net income, total assets, and optional revenue to calculate your ROA ratio with a DuPont analysis breakdown and industry benchmark comparisons.

Calculate Return on Equity (ROE) with DuPont analysis breakdown, step-by-step formulas, industry benchmarks, and visual performance gauges. Analyze profitability, efficiency, and leverage metrics for investment decisions.

Calculate Return on Net Assets (RONA) with step-by-step formulas, industry benchmarks, visual gauge, scenario analysis, and comprehensive profitability insights.

Calculate Return on Sales (ROS) ratio with step-by-step breakdown, industry benchmarks, profitability analysis, and visual gauge. Evaluate operational efficiency and compare performance across industries.

Enter revenue and headcount for one company, or for as many as five. Get revenue per employee and a side-by-side rank.

Estimate the proceeds from a HECM reverse mortgage. Models the HUD age-and-rate Principal Limit Factor, FHA lending limit, MIP, origination cap and servicing set-aside, and compares lump sum, tenure, term and line-of-credit payouts.

Calculate the statistical probability of losing your entire trading capital based on win rate, payoff ratio, and risk per trade. Features interactive risk visualization, sensitivity analysis, and detailed probability breakdown.

Calculate your Required Minimum Distribution from a Traditional IRA, 401(k), 403(b) or other retirement account using the latest IRS Uniform Lifetime Table, with year-by-year projections, tax estimates and a depletion timeline.

Enter EBIT, total assets, and current liabilities to calculate return on capital employed with step-by-step math and industry benchmark comparisons.

Enter the amount invested, what it is worth now, and the start and end dates. Get ROI, annualized ROI, and CAGR.

Split rent fairly among roommates by room size, private amenities such as an en-suite, balcony or best window, and optionally each person's income, instead of dividing equally. See who pays what and how it compares to an even split.

Enter your age, balance, annual contributions, return rate, and tax brackets to project your retirement savings and compare Roth vs. Traditional IRA growth.

Use the Rule of 72 to instantly estimate how long it takes to double your investment at a given interest rate. Features interactive timeline visualization, comparison of approximation rules, and growth projections.

Calculate the payment, total interest and full cost of an RV, camper or motorhome loan. Handles trade-ins, percent or fixed down payments, sales tax rolled in and long terms, and overlays the balance against the rig's depreciating value.

Work out SaaS pricing tiers and project ARR and MRR from per-seat or per-account prices, expected customer counts and billing cycle. Visualise the tier revenue mix, the Good-Better-Best ladder, blended ARPA and net revenue retention.

Enter average demand, lead time, variability values, and target service level to calculate required safety stock and reorder points.

Convert wages between hourly, daily, weekly, bi-weekly, semi-monthly, monthly, quarterly, semi-annually and annually. Visualize your income breakdown with interactive charts.

Enter your current salary, raise percentage or amount, and optional inflation rate. See your new total earnings, per-paycheck increase, and real pay growth.

Enter an amount and tax rate or select a state. Calculate the sales tax amount, total price including tax, or reverse-calculate the pre-tax price.

Check where your business has triggered economic nexus for US sales tax. Enter revenue and transaction counts to see which states you must register in, how close you are to each threshold, and a colour-coded risk map of all 50 states.

Convert satoshis (the smallest unit of Bitcoin) to USD and other fiat currencies. Includes visual breakdown, step-by-step calculations, and Bitcoin unit conversions.

Calculate how your savings will grow over time with compound interest, monthly deposits, and detailed year-by-year projections. Includes growth charts, milestone tracking, and inflation-adjusted estimates.

Calculate how much you need to save each month to reach your financial goal by a target date. Includes growth chart, milestone tracking, and step-by-step breakdown with interest compounding.

Enter the award, hours to apply, and your chance of winning. Get the risk-adjusted payoff per hour and a comparison with working.

Enter annual income, deductions, fair market rent, contract rent, and utility allowance to calculate the tenant rent share and housing assistance payment.

Enter net self-employment earnings. Get a 2025 Social Security and Medicare estimate, a quarterly schedule, and a comparison with W-2 costs.

Estimate your severance package from years of service and weekly pay. Choose a weeks or months per year formula with an optional cap, add unused PTO, and see the after-tax amount plus a runway gauge of months it covers.

Calculate the Sharpe Ratio to measure risk-adjusted investment returns. Analyze portfolio performance with step-by-step calculations, interactive charts, and professional benchmarking.

Enter your selling price, COGS, shipping, ad spend, and transaction fees to calculate net per-order profit, break-even ROAS, and max CPA.

Calculate short selling profit or loss including stock borrow fees, margin interest costs, and commissions. Visualize your short position breakdown with interactive charts and detailed cost analysis.

Enter revenue, costs, and hours. Get net profit, effective hourly pay, return on money spent, and a comparison with a day-job wage.

Calculate simple interest instantly with interactive charts, payment schedules, and step-by-step breakdowns. Compare with compound interest and visualize your investment growth.

Model returns from systematic investment plans over time. Calculate how regular monthly investments grow with compound interest, step-up SIP, and lump sum additions.

Enter birth year, average earnings, filing age, COLA, and life expectancy to compare monthly benefits from 62 to 70, break-even, and lifetime totals.

Calculate the Sortino ratio from direct inputs, derive it from a return series with a full downside-deviation breakdown, or compare up to five portfolios. Visualises the split around your Minimum Acceptable Return.

Calculate your new average cost per share when buying additional shares at a lower price. Essential tool for managing bag holding positions with detailed breakdowns, interactive visualizations, and scenario analysis.

Calculate the beta coefficient of a stock from periodic returns, raw prices, or summary statistics. See alpha, R-squared, systematic vs unsystematic risk, and the CAPM expected return.

Enter buy and sell prices, share count, and commissions to see profit or loss, ROI, the break-even price, and annualized return.

Enter your shares, price, and a forward or reverse split ratio to see the new share count, adjusted price, position value, cost basis, and any fraction.

Enter an entry and a risk/reward ratio, or your own stop and target, to calculate stop-loss and take-profit prices and a position size.

Calculate Stripe processing fees and the exact net payout on any charge. Gross-up mode finds what to charge so you net a target amount. Supports capped fees like ACH Direct Debit, editable rates and a monthly fee projection.

Enter the balance, rate, and payment to see a payoff schedule, and how extra payments change the amortization.

Add up your monthly, weekly, quarterly and yearly subscriptions to see their true annual and monthly cost in one place. Spot recurring spending, mark services to cancel, and see how much you could save. Your list is saved privately.

Plan a Systematic Withdrawal Plan. Enter your corpus, monthly withdrawal and expected return to see how long the money lasts, the final balance, total withdrawn and interest earned, with an optional annual step-up for inflation.

Calculate the discount purchase price, dollar return and yield of a US Treasury bill from 4 to 52 weeks. Get the bank discount rate, coupon-equivalent yield, effective annual yield, and the tax-equivalent yield a taxable CD must beat.

Determine your 2025 or 2024 federal tax bracket instantly. Visualize how progressive taxation works with animated bracket breakdowns, compare all filing statuses side-by-side, and see exactly how each dollar of your income is taxed.

Estimate your 2025 tax refund or amount owed before filing. Enter income, withholdings, deductions, and credits to see your estimated federal and state refund with a visual tax breakdown and personalized withholding optimization tips.

Enter your tax bracket and a municipal bond yield to calculate the tax-equivalent yield and compare it with a taxable investment.

Calculate the Times Interest Earned (TIE) ratio with step-by-step analysis, financial health assessment, visual gauges, and industry benchmark comparison. Evaluate debt coverage capacity and creditworthiness.

Calculate tip amounts and split the bill among any number of diners. Includes a real-time visual breakdown, an animated receipt, tip quality ratings, multi-scenario comparison and round-up options for any tipping situation.

Enter the tip pool and each employee's hours, or hours and role points, to split it to the penny and show each share's hourly rate.

Split a restaurant bill unevenly per person with individual subtotals, proportional tax allocation, custom or uniform tip percentages, optional service charge or discount, and clear payment amounts for each diner.

Calculate your tithe, traditionally 10%, on gross or net income. See the gross-versus-net comparison side by side, a per-paycheck giving breakdown for annual, monthly, bi-weekly and weekly pay, and add an optional freewill offering.

Calculate total asset turnover ratio with step-by-step formula breakdown, industry benchmarks, efficiency rating, and visual analysis. Measure how effectively a company uses its assets to generate revenue.

Plan total trip costs across flights, accommodation, food, local transport, activities, insurance, extras, and an unexpected-expense buffer. See daily and per-person breakdowns.