Miscellaneous

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.

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

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.

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.

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.

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.

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.

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.

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.

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

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 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.

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.

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.

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

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.

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.

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.

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 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.

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.

Enter bed area, a recommended nutrient rate and the bag's N-P-K percentages. Calculate fertilizer weight and see the nitrogen, phosphate and potash supplied.

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

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

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.

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

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.

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.

Estimate your homebrew's ABV from original and final specific gravity. Choose from three formulas and see apparent attenuation and estimated calories per 12 oz.

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.

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.

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.

Search job listings by title, keywords, or company and narrow results by location. Sort by relevance, date, or salary and open listing links.

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.

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.

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.

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

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.

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.

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.

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.

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.

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

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

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

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

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.

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.

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

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 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.

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.

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

Find quotes by keyword, topic or author and copy the text you want. Create a quote card, adjust its width and download it as a JPG.

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

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 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.

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.

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.

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.

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.

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.

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 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.

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.

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.

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.

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

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.

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.

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

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.

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

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 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.

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.

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 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.

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

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.

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.

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

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.

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.

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

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 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 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.

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.

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.

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.

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.

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 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.

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.

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.

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

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

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.

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.

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.

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

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

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.

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 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.

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.

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.

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

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.

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

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.

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.

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.

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

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.

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

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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

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.

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.

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 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 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.

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

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.

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.

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.

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

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.

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.

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

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.

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

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.

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

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

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.

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 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.

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.

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.

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.

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 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.

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.

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.

Estimate roofing materials from roof dimensions, shape, and pitch. Choose shingles, metal, tiles, or underlayment and set a waste allowance.

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 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.

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

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.

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.

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.

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.

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.

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.

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

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.

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

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!

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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

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

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.

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

Upload a selfie to find your face shape and the haircuts that suit it and your hair type, with what to tell your stylist, what to avoid, and a try-on prompt for Gemini or ChatGPT.

Turn a photo of handwriting into editable text: notes, letters, recipe cards and forms, even joined-up cursive, with every word it is unsure of marked so you know what to check.

Upload any picture and get ready-to-paste prompts that recreate it in ChatGPT, Gemini (Nano Banana), Midjourney, Stable Diffusion or Flux, and a video version, plus a breakdown of its style, light and camera.

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.

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.

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.

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.

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.

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.

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

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.

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.

Set any image to the opacity you want and export it as a transparent PNG. Slide from 0 to 100%, or fade it out with a linear, radial or edge gradient, and preview the result on white, black or any color before you download.

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.

Choose rows and columns or a grid preset, then drag the guides to adjust each split. Download the resulting PNG pieces individually or together as a ZIP.

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.

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.

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.

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

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

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.

Knock out a white or single-color background and download a transparent PNG. A tolerance scan recommends the safe threshold, backdrop proofs reveal halos, and edge shrink plus despill clean the outline - all inside your browser.

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

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.

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

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 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.

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

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

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

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.

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.

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.

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.

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.

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.

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.

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

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

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

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

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 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.

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

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.

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.

Calculate unloaded output voltage or find the resistor needed for a target Vout. Review divider current and power dissipation for each resistor.

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 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.

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.

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.

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

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

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.

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.

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

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.

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

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.

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

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 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.

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.

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.

Enter your full name to calculate its numerology number from 1 to 9. See each letter's value, the digit reduction steps and the numerology meaning.

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.

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

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

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.

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

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

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

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.

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.

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

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.

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 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.

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

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.

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

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.

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.

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.

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

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

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

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.

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

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

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

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.

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.

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.

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.

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.

Enter a temperature and its unit to see Celsius, Fahrenheit, Kelvin, Rankine and Réaumur values together, with formulas and reference points.

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.

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

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.

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.

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

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.

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.

Enter the original and new pan dimensions to find a recipe scale factor. Add ingredient amounts to get scaled quantities for your pan.

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.

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.

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.

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.

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.

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.

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

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.

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

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.

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.

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 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.

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.

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.

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.

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.

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.

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

Choose your dish, main ingredient, cooking method, and cuisine for ranked wine suggestions. See pairing reasons, serving temperatures, and grape ideas.

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.

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

Find a solution's boiling point rise using molality or solute mass, molar mass and solvent mass. Set the solvent and van't Hoff factor to see the new boiling point.

Enter an unbalanced chemical equation to find its coefficients. Follow the solution steps and compare atom counts on both sides.

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

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

Find a compound's empirical formula from element masses or percentages, with calculation steps. Add molar mass to also find its molecular formula.

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.

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.

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.

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

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 molar mass in g/mol from a formula such as H2O or Ca(OH)2. See each element's contribution and the calculation steps.

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.

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

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.

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

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.

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

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

Enter pKa, Ka, pKb or Kb to calculate the other three values for a conjugate acid-base pair. Adjust pKw or use the default 14.00 at 25°C.

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

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.

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

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.

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.

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.

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.

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.

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.

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

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.

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

Convert recipe amounts between tablespoons and cups in either direction. Choose US, Metric or Imperial settings and view a measuring-cup diagram.

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.

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.

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.

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.

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

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 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.

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.

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.

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.

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 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.

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

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.

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.

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.

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

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

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

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.

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.

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.

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.

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

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.

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

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

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

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

Upload a video and choose how many random thumbnails to generate. Preview the video, then download the thumbnails individually or together as a ZIP file.

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

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

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

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).

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.

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.

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

Convert land area from perches to acres or back again using 160 perches per acre. Choose decimal precision and see square-foot and square-meter equivalents.

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.

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.

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.

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.

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.

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.

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.

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.

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

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

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.

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

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.

Upload a photo to find out what breed or mix a dog is, with each breed's likely share, grown-up size, energy, shedding, health to watch and care tips; or answer a few questions to find the breed that suits you.

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

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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 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.

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 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.

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.

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.

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

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

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

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.

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.

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.

Estimate yardage from piece dimensions, quantity and fabric width. Include seam allowance, directional prints and extra fabric, then view a cutting diagram.

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.

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.

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.

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.

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.

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).

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.

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.

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.

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.

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

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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.

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 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.

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.

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 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.

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.

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

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.

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

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

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.

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.

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.

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.

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.

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.

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.

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.

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

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.

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

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

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 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.

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

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 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.

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.

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

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.

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

Generate 1–28 random LONG or SHORT orders for paper trading exercises. Each result uses a different currency pair, and you can copy the full list.

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.

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.