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.

Suggest thoughtful, personalised presents based on the recipient, occasion, budget and their interests. Get a curated list of gift ideas with the reason each one fits, an estimated price and a one-click 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.

Calculate how much food weight to carry for a backpacking, trekking, or thru-hiking trip. Estimate total calories, food weight, daily carry, safety buffer, meal split, and day-by-day pack weight burn-down with imperial or metric units.

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

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.

Convert betting odds between American, decimal, fractional and implied probability. See your payout for any stake, your break-even win rate, and enter both sides of a market to expose the bookmaker's vig and the fair no-vig odds.

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.

Calculate the final ABV (alcohol by volume) of any cocktail or mixed drink. Add ingredients with their volume and ABV, factor in ice melt dilution, and get an accurate alcohol percentage with visual breakdown and step-by-step calculation.

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.

Calculate the true financial cost of smoking over time. See daily, monthly, yearly, and lifetime costs with investment opportunity analysis and health recovery timeline.

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.

Free online CTR calculator to compute click-through rate from impressions and clicks. Compare multiple campaigns, see industry benchmarks, and find how many clicks you need to hit your target CTR.

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.

Find the most efficient way to load your dishwasher. Enter what needs washing and your machine size to sort every item into the right rack zone, check spray-arm clearance, count the cycles needed and rate water and energy use.

Calculate the Elo rating change after a match from both ratings, the result and your K-factor. See the new rating, win probability, a live win/draw/loss scenario table and an expectancy curve, for chess, esports or any Elo ranking.

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.

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

Calculate the great-circle air-route distance between airports, major cities, or coordinates. Estimate flight time using typical aircraft cruising speeds, route allowance, nautical miles, bearing, and an animated route map.

Estimate average first and last frost dates from a USDA hardiness zone and geographic region. Plan safe planting windows, growing season length, and crop timing around frost risk.

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.

Calculate real-world gas mileage from fill-up data. Enter distance driven or odometer readings plus fuel added to get MPG, L/100km, km/L, trip cost, range, and CO2 estimates.

Mix hair dye with confidence. Enter your colour-to-developer ratio and either the total you want, the colour you already have, or your hair length, and get the exact grams or millilitres of each plus how many tubes you need.

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.

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

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.

Calculate the return on investment for influencer marketing campaigns. Analyze cost per engagement, earned media value, conversion rates, and compare performance across Instagram, TikTok, YouTube, and Twitter/X with industry benchmarks.

Calculate your Instagram engagement rate from likes, comments, saves, and followers. Compare against industry benchmarks by account size and get actionable tips to boost your social media performance.

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.

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

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.

Explore common outdoor knots with an interactive chooser, animated rope diagrams, step-by-step tying instructions, best-use guidance, safety notes and a comparison table for camping, hiking, boating, tarps and loads.

Generate fractals from Lindenmayer-system rules. Pick a preset - Koch snowflake, Sierpinski, dragon curve, fractal tree or plant - or write your own axiom, production rules and turtle angle, and watch a depth-coloured SVG draw itself.

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.

Calculate how much lawn fertilizer to apply from lawn area, nitrogen rate per 1,000 sq ft, and the N-P-K fertilizer analysis. Includes product weight, bag coverage, and nutrients applied.

Estimate how many standard 2x4 Lego bricks it takes to build a life-size house. Enter your house dimensions, wall thickness and window and door count to get a brick count, total weight, estimated cost and real-world comparisons.

Calculate how much money you save by switching from incandescent or CFL to LED light bulbs. Compare energy costs, bulb replacement costs, lifespan, and see your payback period with a 10-year cost projection.

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.

Convert any number to English words instantly. Supports cardinal, ordinal, and currency formats.

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.

Calculate the required number of parking spots based on building square footage and usage type. Supports retail, office, residential, restaurant, medical, hotel, industrial, and more with ITE standard parking ratios.

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.

Create custom QR codes for URLs, text, WiFi, email, and phone numbers. Customize colors, size, error correction, and download as PNG instantly.

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

Calculate how much soil mix you need for a raised garden bed from length, width, and depth. Includes cubic feet, cubic yards, liters, fill ratio, settling allowance, bag estimates, and soil mix breakdowns.

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.

Generate the Sierpinski triangle at any depth by deterministic recursive subdivision or the chaos-game random walk. Compare both algorithms side by side, colour triangles by depth, and export a crisp SVG or PNG.

Convert sleeping bag temperature ratings between EN, ISO and common brand labels. Decode comfort, limit and extreme ratings, estimate women's equivalents, and adjust for cold sleepers, pad R-value and wet or windy conditions.

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.

A complete reference for recommended image and video dimensions across Instagram, Facebook, X, YouTube, TikTok, LinkedIn and Pinterest, covering profile pictures, covers, posts, stories, reels and ad formats with visual previews.

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.

Calculate the right tent footprint size from your tent floor dimensions. Choose imperial or metric units, set the undercut margin per side, and get finished footprint dimensions, DIY cut size, area coverage, and a clear visual layout.

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.

Decode the load index and speed rating from your tire code. Paste a size like 225/45R17 94V to see the maximum load per tire in kg and lbs, the total your set can carry, and the speed rating in km/h and mph with reference charts.

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

Estimate how much tread life and how many miles your tires have left. Enter current tread depth and either a known wear rate or two measurements taken some distance apart to get miles until the legal limit and a replacement date.

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.

Calculate the ideal trailer tongue weight - usually 10-15% of total trailer weight - for sway-free towing. Enter the loaded weight for a target range, or a measured weight for a safety diagnosis and advice on which way to shift cargo.

Find the ideal TV size for your room from your viewing distance and resolution. Recommends a screen size in inches, shows a to-scale room diagram with your viewing angle, and checks whether 1080p, 4K or 8K is sharp enough at that distance.

Estimate Twitch streamer earnings from subscriptions, ads, bits, and donations. Compare Affiliate vs Partner revenue splits with detailed breakdowns, growth projections, and monetization tips for streamers at every level.

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.

Generate Voronoi diagrams from seed points. Click to add or drag points, switch between Euclidean, Manhattan, Chebyshev and Minkowski metrics, watch cells animate into place, and export SVG or PNG. Includes Lloyd relaxation.

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.

Compare a new wheel and tire setup against your current one to see how far the wheel pokes toward the fender and tucks toward the suspension. Enter width, offset and tire section width for poke, 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.

Estimate YouTube ad revenue for any channel or video based on views, niche CPM, and monetization rate. See daily, monthly, and yearly earnings projections with detailed breakdowns, RPM analysis, and revenue optimization tips.

Estimate potential earnings from YouTube Shorts based on views, niche RPM rates, and the Shorts revenue sharing model. Compare Shorts revenue with long-form video earnings, visualize the revenue flow, and project growth over time.

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.

Free online tool to download YouTube video thumbnails in all available resolutions. Paste any YouTube URL or video ID to instantly preview and save HD, SD, and default thumbnail images.

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.

Calculate damage per second (DPS) for any weapon loadout. Includes raw DPS, sustained DPS with reload, effective DPS with critical hits, burst damage, and time-to-kill analysis with animated visualizations.

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.

Calculate the heat index (apparent temperature) from air temperature and relative humidity using the official NWS Rothfusz formula. Includes danger level assessment, step-by-step calculation, and interactive heat index chart.

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.

Calculate your chances of getting rare loot drops over multiple attempts. Visualize probability curves, see expected attempts, and plan your grind with step-by-step math breakdowns for any game.

Calculate the dew point temperature from air temperature and relative humidity using the Magnus formula. Includes comfort assessment, frost point, wet-bulb estimate, step-by-step calculation, and interactive dew point chart.

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.

Calculate acceleration from velocity change and time, force and mass, centripetal motion, or free fall. Get step-by-step solutions, g-force comparisons, and velocity-time graphs.

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.

Calculate buoyant force and see whether an object floats or sinks by Archimedes' principle. Enter the fluid, volume and mass to get buoyant force, apparent weight, density, the submerged fraction and reserve buoyancy on a tank diagram.

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.

Calculate the de Broglie wavelength of any particle from mass and velocity or from kinetic energy, using relativistic momentum. See where it lands beside real structures and whether the particle behaves as a wave or classically.

Calculate density from mass and volume, or solve for mass or volume given density. Supports multiple unit systems with step-by-step solutions 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.

Compute the electric field from one or many point charges with full vector superposition. Place up to six charges in the plane, pick a test point, and read the components, magnitude, direction, 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.

Calculate engine displacement from bore, stroke and cylinder count. Get the result in cc, litres and cubic inches, see displacement per cylinder, and read the bore/stroke ratio as oversquare, square or undersquare with a diagram.

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.

Calculate how far your headlight beam reaches from its mounting height and downward aim angle. See the near edge, beam centre and maximum reach on a side-view diagram, plus a glare warning and a stopping-distance safety check.

Calculate the rate of heat transfer by conduction, convection and radiation. Enter material, area, thickness and temperatures to find the rate in watts, heat flux, thermal resistance and total energy, with a built-in property library.

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.

Calculate the forces, acceleration and friction on an object on an inclined plane. Enter mass, angle and friction coefficients for the weight components, normal force, static and kinetic friction, and a will-it-slide verdict.

Calculate the orbital period of a planet, moon, satellite or star with Kepler's Third Law. Enter the semi-major axis and central mass in AU, km, solar or Earth masses to get the period, mean orbital velocity and an orbit diagram.

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.

Calculate kinetic energy using KE = ½mv². Enter any two values to solve for the third. Supports multiple units with step-by-step solutions and real-world 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.

Compute the magnetic field around a conductor with the Biot-Savart and Ampere laws for three geometries: an infinite straight wire, a circular loop on axis, and a finite or ideal solenoid with an optional ferromagnetic core.

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.

Compute the moment of inertia for 15 common shapes - both the area moment used in beam bending and the mass moment used in rotational dynamics. Switch units freely, add a parallel-axis offset, and read centroid 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.

Calculate the period of a simple pendulum from its length and gravity. Solve for period, length, frequency or gravity, pick a planet's gravity in one click, and compare the small-angle approximation with the exact elliptic formula.

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.

Calculate the Reynolds number from fluid velocity, characteristic length, density and viscosity to see whether a flow is laminar, transitional or turbulent. Choose pipe, flat-plate or open-channel flow with the right critical thresholds.

Apply Snell's Law to find the angle of refraction, the refractive index, the critical angle for total internal reflection and Brewster's angle. Pick from a material library or enter custom indices and watch the rays animate.

Calculate the heat energy needed to change a substance's temperature with Q = m x c x dT. Solve for heat, mass, specific heat capacity or final temperature, using a built-in library of substances and an animated thermometer.

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.

Calculate the spring constant, restoring force, displacement or stored elastic energy with Hooke's law. Supports SI, metric and imperial units, springs in series or parallel, and gives the oscillation 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 velocity from distance and time. Supports average velocity, relative velocity, angular to linear conversion, and instant unit conversions 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.

Work out how many tons of hot mix asphalt a driveway, parking lot or road needs. Enter area, compacted thickness and mix density to get tonnage, cubic yards, truckloads and cost, with a cross-section diagram and waste buffer.

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.

Calculate how many bricks and how much mortar you need for your wall project. Supports doors/windows, multiple brick sizes, bond patterns, and cost estimation.

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.

Find the right ceiling fan blade span and downrod length for your room. Enter the room dimensions and ceiling height to get a fan diameter, downrod size, mounting type and safe hanging height on a to-scale side-view diagram.

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.

Calculate cubic yards for concrete, gravel, mulch, topsoil and sand. Enter length, width and depth in feet, inches, yards or metres to get the yards to order plus weight in tons, dump-truck loads, bags and a waste buffer.

Work out the curtain panel width and length you need from your window measurements, fullness ratio and where the curtains should fall. See a to-scale diagram plus the ready-made size to buy and the cut dimensions for sewing.

Estimate how many gallons of deck stain the boards, railings and stairs need. Adjusts coverage for stain type, wood surface and number of coats, then tells you how many cans to buy, the leftover and the estimated cost.

Calculate all materials needed for your deck project including decking boards, joists, beams, posts, and fasteners. Features interactive SVG diagram, waste allowance, and support for both imperial and metric units.

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.

Measure a firewood stack and see how many full cords and face cords it holds, the total volume, and - if you enter what you paid - the real cost per cord with a fair-price verdict, plus estimated delivery weight by wood type.

Calculate flooring material needed for any room with our free flooring calculator. Supports hardwood, laminate, vinyl, tile, and carpet. Get box/roll counts, cost estimates, waste allowance, and multi-room totals with visual diagrams.

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

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

Calculate the BTU and tonnage needed to heat or cool any room or building. Factors in room dimensions, insulation quality, climate zone, sun exposure, windows, occupancy, and appliances for accurate HVAC load estimation.

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.

Calculate how much mulch, topsoil, gravel, or sand you need for your landscaping project. Get accurate volume in cubic yards/meters, weight estimates, bag counts, and delivery truck loads with interactive 3D visualization.

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.

Find exactly where the nail or hook goes to hang a picture at the gallery-standard 57-inch centre height. Enter frame height and wire drop for the hook height from the floor, plus centring for one or two hooks and an above-furniture mode.

Calculate flow rate, velocity, Reynolds number, head loss, and pressure drop for fluids in pipes. Compare Hazen-Williams and Darcy-Weisbach + Colebrook-White results side-by-side, with PVC, copper, steel, cast iron, and HDPE pipe presets.

Calculate pond volume in gallons and litres and the exact flexible liner sheet size you need, including wall drape and edge overlap. Supports rectangular, circular and oval ponds, with pump flow rate and safe fish stocking estimates.

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.

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

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.

Calculate slope as a percentage, ratio or angle from rise and run, or work back to a missing dimension from a known slope. Includes ADA compliance checking, a steepness gauge and advice for ramps, drainage, driveways and roofing.

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.

Calculate the number of studs, plates and lumber a wall framing project needs. Includes interactive wall diagrams, support for door and window openings, cost estimation and framing tips for 16 or 24 inch on-centre spacing.

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.

Find the ideal height to mount your TV from the screen size and your seated eye level. Gives the floor-to-centre, floor-to-bottom and floor-to-top heights, checks the viewing angle for neck comfort, and recommends a 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.

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.

Calculate antenna length from any frequency for half-wave dipoles, quarter-wave verticals, ground planes, full-wave loops and 5/8-wave verticals. Get metres and feet, each leg or radial, wavelength and an adjustable velocity factor.

Convert between battery capacity, C-rate and charge or discharge current, and see how long the pack lasts. Checks the result against safe continuous limits for LiFePO4, Li-ion, LiPo, NiMH, LTO and lead-acid, with a C-rate ladder.

Calculate battery internal resistance in milliohms from the voltage drop under load, by single reading, two-load delta-V over delta-I, or a known load resistor. Grades the result and shows wasted power, efficiency and voltage sag.

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.

Find the capacitor bank kVAR needed to correct power factor to your target. Enter kW, kVA or measured volts and amps to get required kVAR, a bank built from standard steps, per-phase microfarads for delta and wye, and fuse sizing.

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.

Calculate NEC conduit fill percentage from your conductors and conduit. Mix wire sizes and insulation types, pick EMT, PVC, RMC or IMC or auto-find the smallest legal trade size, and check the 53%, 31% and 40% limits.

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

Find out what size generator you need. Pick appliances from a library of running and surge wattages, and the calculator sizes it properly - total running watts plus only the single largest motor surge, since not everything starts at once.

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.

Calculate inductive reactance with XL = 2*pi*f*L, solving for reactance, frequency or inductance with automatic engineering units. See the 90-degree phase lag on a waveform, a reactance-versus-frequency curve and RMS current.

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.

Convert lumens to watts and compare the equivalent wattage across LED, CFL, halogen and incandescent bulbs. Enter a brightness in lumens or an old incandescent rating to see what each bulb draws and how much switching to LED saves.

Convert lux to lumens for any room from the target illuminance and the room area or dimensions. See the lumens needed, a realistic figure allowing for light loss, how many bulbs that takes, and recommended lux levels room by room.

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.

Calculate any electrical value (Voltage, Current, Resistance, Power) using Ohm's Law. Enter any two known values to instantly compute the other two with detailed formulas and step-by-step solutions.

Calculate the total equivalent resistance of 2 to 10 resistors connected in parallel. Features an interactive circuit diagram, step-by-step formula breakdown, current distribution analysis, and power sharing visualization.

Calculate the trace width your PCB needs from current, temperature rise and copper weight using the IPC-2221 formulas. Includes a visual trace preview, resistance calculation and voltage drop analysis for the finished trace.

Calculate how much current a PCB via can safely carry from its finished hole size, plating thickness and allowed temperature rise, and how many vias in parallel your target needs. Also reports resistance, voltage drop and power loss.

Work out how long a battery really lasts under load with Peukert's law instead of amp-hours divided by amps. Enter the rated capacity and hour rate, pick a chemistry, give the load, and get true runtime and capacity actually delivered.

Calculate real, reactive, and apparent power relationships, power factor correction, and power triangle analysis for AC circuits. Get step-by-step breakdown with formulas.

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.

Add any number of resistors in series to find the total resistance. Add a supply voltage and it also solves the shared current, the voltage dropped across each resistor and the power each dissipates, with a circuit diagram.

Calculate resonant frequency, bandwidth, and Q factor for LC and RLC circuits in series and parallel configurations. Solve for frequency, inductance, or capacitance with step-by-step MathJax formulas.

Calculate the total lumens and number of bulbs a room needs from its type and size. Uses the professional lumen method with room-by-room foot-candle targets, adjusts for ceiling height, and shows where to place your fixtures.

Calculate the equivalent capacitance of capacitors in series or parallel. Add any number in pF, nF, uF, mF or F to see the total, an animated circuit diagram, how charge and voltage split, and the energy stored.

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

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

Convert 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.

Calculate a wire's resistance from its length, AWG gauge or area, conductor material and operating temperature. Applies the temperature coefficient, supports round-trip runs and parallel conductors, and adds AC skin effect and voltage drop.

Generate original band names by genre - rock, metal, punk, indie, pop, hip-hop, electronic, jazz, folk, country and more. Each gets a Brandability score estimating how free the .com and social handle are, with a preview.

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.

Generate fantasy character names by race and gender - elf, dwarf, orc, dragon, human, halfling, fairy and demon. A procedural rune forge builds original names with a pronunciation, an epic epithet and a 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.

Generate reflective journal prompts by theme - gratitude, growth, creativity, mindfulness, relationships, career, healing, morning pages and shadow work. A Depth dial picks Light, Deep or Profound, each with a Go Deeper follow-up.

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.

Generate a surprising random fact by topic with a source you can verify. Pick a category like Space, Animals, the Human Body, History or Science and get a mind-blowing fact with a surprise-meter rating and a link to its source.

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.

Simulate a vampire outbreak using the Lotka-Volterra predator-prey model. Set initial populations, feeding rates, and conversion rates to see how quickly humanity falls — or fights back.

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

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.

Turn the dream you remember into a symbol-based reading. Describe it, say how you felt on waking and pick a symbolic, psychological, emotional or spiritual lens for a symbol map, emotion chart and reflective questions. For fun only.

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.

Analyze the balance of the three modalities (Cardinal, Fixed, Mutable) in your birth chart to understand how you initiate, stabilize, and adapt to life's changes.

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.

Discover your Celtic Tree Sign based on the ancient druidic lunar calendar. Find your sacred tree among 13 Celtic trees like Birch, Oak, Willow, and explore its unique symbolism, personality traits, and spiritual meaning.

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.

Calculate your numerology destiny number (life path number) from your birth date with step-by-step reduction, detailed 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.

Calculate your life path number based on your birth date. Discover your destiny, life purpose, and personality traits with detailed numerology interpretation and step-by-step calculation.

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 if Mercury is retrograde now. View complete Mercury retrograde dates, shadow periods, and zodiac signs for any year (1900-2100) with Swiss Ephemeris accuracy.

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.

Discover the emotional compatibility between two people based on Moon signs. Calculate Moon positions using precise astronomical data and receive detailed analysis of emotional dynamics, nurturing styles, and relationship harmony.

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

Find precise dates and times of all New Moons and Full Moons for any year from 1900 to 2100. Includes zodiac positions, spiritual meanings, and intention guidance for each lunar phase.

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

Calculate your numerology personality number based on the consonants in your name. Discover how others perceive you with detailed step-by-step calculation and 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.

Calculate your Sun, Moon and Rising signs from your birth date, time and location. Explore their astrological interpretations and elemental relationships.

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.

Discover your zodiac sign instantly! Enter your birth date to reveal your astrological sign, personality traits, element, ruling planet, 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.

Convert file sizes between all units (Bits, Bytes, KB, MB, GB, TB, PB) with binary (1024) and decimal (1000) standards. Includes visual size comparisons and instant all-unit conversion.

Convert fuel economy between MPG (US & Imperial), L/100km, km/L and mi/L instantly. Includes vehicle benchmarks, efficiency rating, tank range projection and CO2 estimate.

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.

Convert miles per hour to kilometres per hour and back with the exact 1.609344 factor. One needle sweeps a dual-scale speedometer so you read both at once, matched to US and European speed-limit signs, plus m/s, ft/s and knots.

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.

Convert measurements between scale model ratios such as 1:72, 1:35 and 1:24 and real-world dimensions. Built for aircraft, vehicles, ships, architectural models and miniatures, with a visual comparison and common scale presets.

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.

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

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.

Turn the ingredients you already have into two complete, easy-to-follow recipes. Add your pantry items, pick a meal type, cuisine and diet, and get step-by-step methods with cook times, servings and smart 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.

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

Calculate 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.

Filter recipes by vegan, vegetarian, gluten-free, dairy-free, nut-free, egg-free, soy-free, shellfish-free, keto and pescatarian needs. Combine several at once and see which diets each recipe satisfies on a colour-coded badge grid.

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.

Estimate how long a ferment takes at your room temperature. Uses the Q10 temperature rule to turn a reference time into a personal estimate for sourdough, kombucha, yogurt, sauerkraut, kimchi, kefir, beer and wine, with 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.

Find the optimal marinade time for meat, fish, tofu or vegetables from the cut thickness and how acidic your marinade is. See a timeline with the under-marinated, optimal and over-cured zones plus the food-science reasoning behind it.

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.

Match the right smoking wood to your meat. Pick a protein - beef, pork, poultry, fish, lamb, game or vegetables - for ranked wood recommendations with pairing strength and smoke intensity, or pick a wood to see what it suits.

Calculate precise sourdough bread recipes with adjustable hydration, starter percentage, and salt ratio. Get complete ingredient lists, feeding schedules, and bulk fermentation timing for any loaf size.

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.

Work out the exact diameter of your dry spaghetti bundle for any number of servings, with an on-screen circle guide you can hold the bundle against. Supports spaghetti, angel hair, linguine, fettuccine, bucatini and more.

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.

Calculate the ideal cooking time for your turkey based on weight and cooking method. Supports oven roasting, spatchcocked, deep-fried, and smoked options with safe temperature guidelines and a complete cooking timeline.

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

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.

Solve the Beer-Lambert law A = elc for absorbance, molar absorptivity, path length or concentration. Converts absorbance to percent transmittance, draws an animated cuvette, plots the calibration line and flags unreliable readings.

Calculate boiling point elevation from molality and the ebullioscopic constant. Includes a solvent library with real Kb data, a van't Hoff factor for ionic solutes, an animated thermometer and a salted-pasta-water reality check.

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

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

Calculate corrected sodium for hyperglycemia using Katz and Hillier formulas. Includes clinical interpretation, step-by-step calculations, and severity assessment for DKA and HHS management.

Calculate solution dilutions using the M₁V₁ = M₂V₂ equation. Find the stock volume, final volume, or resulting concentration when preparing diluted solutions in the lab.

Find the electron configuration of any element or ion, in full and noble-gas form, with an orbital box diagram and Aufbau chart. Gives unpaired electrons, paramagnetic or diamagnetic, valence electrons and d- and f-block exceptions.

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

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.

Explore a searchable periodic table of all 118 elements. Recolour it by electronegativity, atomic radius, ionization energy, density, melting point or discovery year to see trends as a heatmap, and open any element for its full data.

Enter a balanced equation and the amount of each reactant in grams or moles to find the limiting reactant, the excess left over and the theoretical yield of every product. Molar masses are parsed for you, with an optional percent 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 the molar mass of any chemical compound with detailed element breakdown, percentage composition, step-by-step calculations, and interactive periodic table.

Calculate molarity (M), mass of solute, or volume of solution with step-by-step formulas. Features common compound database, unit conversion, and dilution calculator.

Convert between moles, grams, and number of particles (atoms, molecules, ions) using molar mass and Avogadro's number. Get step-by-step conversion solutions with detailed formulas.

Calculate the cell potential of a galvanic cell under non-standard conditions with the Nernst equation. Enter the standard potential, electrons transferred, temperature and reaction quotient to get the 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.

Calculate osmotic pressure with the colligative formula. Enter molarity or derive it from mass, molar mass and volume, pick a van't Hoff factor, and see the pressure in atm, kPa, mmHg, bar and psi plus a tonicity verdict against plasma.

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.

Calculate the percent yield of a chemical reaction by comparing the actual yield to the theoretical yield. Solve for any unknown variable with detailed step-by-step solutions and efficiency analysis.

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

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

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, choose your product and enter how much of each reactant you have to find the theoretical yield in grams and moles. A yield race shows what each reactant could make alone, revealing the limiting reactant.

Calculate the molarity of an unknown acid or base solution using titration data. Features equivalence point pH, indicator recommendations, and step-by-step solutions with titration curve visualization.

Add a solid color frame, gradient border, or Polaroid-style frame with caption to an uploaded image, then download it as PNG or JPG. Set border width per side, round corners, or pad to a social-media aspect ratio.

Draw lines straight onto your images with your choice of colour, thickness and style - solid, dashed, dotted or brush. Includes zoom, undo and one-click PNG download, and your images never leave your device.

Add custom text overlays to images with multiple layers, fonts, colors, and effects like shadow, outline, glow, and 3D. Free online tool with drag-and-drop positioning.

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.

View and remove EXIF metadata from JPG, PNG, WebP, HEIC and TIFF photos in your browser. Inspect camera, lens, exposure, GPS and timestamp tags, map the coordinates, then strip every tag and download a clean copy.

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.

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 images online for free with preset aspect ratios (1:1 Square, 16:9, 4:5 Portrait). No upload required - all processing done locally in your browser for complete privacy.

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

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

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

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

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

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

Convert images to text instantly with free, private OCR in your browser. Supports 100+ languages, drag-and-drop upload, clipboard paste, and image preprocessing. Your images never leave your device.

Generate placeholder images at any size with custom colours, text and styles. Live canvas preview, a URL builder for Lorem Picsum, Placehold.co and DummyImage, ready-to-paste HTML, Markdown and JSX, and PNG, JPG or SVG download.

Calculate the largest high-quality print size for a digital image. Enter the pixel dimensions and your target DPI to see how big you can print while staying sharp, with a visual comparison and standard print sizes.

Add rounded corners to any image and download a transparent PNG. Drag the corner handle or move the radius slider, round each corner on its own, switch between rounded, squircle, bevel and scoop, then copy the matching CSS.

Calculate, convert, and visualize aspect ratios for video, photography, and social media. Resize dimensions while maintaining proportions with live preview.

Convert cubic feet to cubic yards and back for ordering mulch, gravel, topsoil, sand and concrete. See the divide-by-27 breakdown on an animated cube diagram, add a waste allowance, and estimate delivery weight and truck loads.

Convert cubic meters to cubic feet with the exact 35.3147 factor, and back again. See your volume as shipping-container fill, use moving-box and freight presets, and read an isometric size diagram and step-by-step formula.

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

Convert US cups to liters instantly with visual measuring cup reference, common cooking conversions, and bidirectional conversion. Perfect for recipes and cooking measurements.

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.

Convert milligrams to millilitres and back using density, since mass and volume need a density to bridge them. Pick presets for water, milk, cooking oils, honey, alcohol and glycerin, or enter your own, with spoon and drop equivalents.

Convert millilitres to fluid ounces with US and UK Imperial results side by side. Built for cooking measures and skincare bottles, with teaspoon, tablespoon and cup equivalents and an animated dual-scale measuring cup. Reverses too.

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.

Convert fluid ounces to millilitres showing all three answers at once: US (29.5735 mL), Imperial (28.4131 mL) and the rounded bartending ounce (30 mL). Accepts fractions like 1 1/2 oz and recognises shot, bottle and dosing sizes.

Convert quarts to cups instantly with visual measuring guides, bidirectional conversion, multiple measurement systems (US, UK, Metric), common cooking conversions, and step-by-step calculations.

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

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

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

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

Calculate your ACT composite (1-36) from English, Math, Reading and Science scores. See how the rounding works, how many points reach the next composite, your percentile, readiness benchmarks, STEM score and SAT equivalent.

Predict your AP exam score from 1 to 5 using your multiple-choice and free-response performance. Pick your subject to apply its real curve, see where you land on the composite line, and how many more points reach the next score.

Calculate your attendance percentage, then see how many classes in a row you must attend to reach 75%, 80%, 85% or a custom target - or how many you can safely skip. Includes an end-of-term projection and a visual gauge.

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.

Calculate your GPA (Grade Point Average) with course credits and grades. Supports US 4.0 scale, plus/minus grades, weighted GPA, and multiple grading systems.

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.

Estimate how many study hours fluency in any language takes and how long that is at your own pace. Pick a target language and CEFR level, and FSI difficulty categories give total hours, a completion date and a pace comparison.

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.

Turn your own word list into an interactive vocabulary quiz, flashcards or a printable worksheet. Paste words and definitions to generate multiple-choice tests, self-grading flashcards and a print-ready worksheet with 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.

Generate random thumbnails from uploaded videos.

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.

Convert Indian land units - bigha, biswa, katha, gaj, marla, kanal, cent, guntha, ground and more - to square feet, square metres, acres and hectares. A bigha differs by state, so every result is re-based on the state you pick.

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

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.

Convert square feet to square metres and picture the space. Get the exact value, a to-scale blueprint on a feet grid, the room dimensions producing that area, and real-estate references, 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.

Convert square metres to square feet and picture the space. Get the exact value, a to-scale floor plan on a metric grid with a real object for scale, and references like parking spaces and tennis courts, 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.

Convert square yards to acres and acres to square yards instantly. Features visual size comparisons, step-by-step calculations, and multi-unit conversions for land measurement.

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.

Delete pages from a PDF and download the trimmed file. See every page as a thumbnail and tap the ones to remove, or switch to Keep only mode. Type ranges like 2, 5-8, 11, and let the blank-page detector flag empty scanned backs.

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.

Bake form fields, comments and annotations into a PDF so it can no longer be edited. The tool first x-rays the file, listing every field and annotation and drawing the live regions on each page, then flattens smartly or rasterizes.

Pull the pages you choose out of a PDF and download them as a new file. Tap page thumbnails or type a list like 1, 4-6, 9, search the text to select every page mentioning a word, and reorder them in a live filmstrip before saving.

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.

Get a PDF's selectable text back as clean, readable plain text. Rebuilds reading order from the page layout so two-column papers are not jumbled, strips repeating headers and footers, rejoins hyphenated words and reflows paragraphs.

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.

Password protect a PDF with strong AES-256 encryption. Protect one file or up to 30 at once, set an open password, and optionally add permissions that block printing, copying or editing. Includes a strength meter and password generator.

Reorder the pages of a PDF by dragging them into place, then download the rearranged file. Each thumbnail shows both its new position and its original page number, with one-tap helpers to reverse the file 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.

Split a PDF into separate files. See every page as a thumbnail, then cut it into custom ranges with the scissors between pages, extract every page on its own, split every N pages, or pick just what you need. Download each part or a 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.

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.

Generate beautiful, harmonious color palettes based on color theory. Create analogous, complementary, triadic, split-complementary, tetradic, and monochromatic color schemes with export options for CSS, SCSS, JSON, and 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 beautiful, harmonious color palettes instantly. Choose from 6 color harmony modes, lock your favorite colors, and export in HEX, RGB, HSL, and CMYK formats. Perfect for designers, artists, and developers.

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.

Find the Clean Air Delivery Rate your air purifier needs. Enter floor area, ceiling height and how clean you want the air to get the required CADR in CFM and m3/h, the air changes per hour, and the AHAM 2/3 benchmark.

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 the levelized cost of electricity (LCOE) per kWh for coal, natural gas, nuclear, solar PV, wind, and hydro using editable capital cost, fuel cost, capacity factor, plant lifetime, O&M, discount rate, and carbon price assumptions.

Calculate EV charging time for any electric car on Level 1, Level 2 or DC fast charging. Includes a realistic two-phase fast-charge curve, an animated battery, a cost estimate, range gained and 50%, 80% and target milestones.

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.

Size a solar charge controller: enter panel specs, series and parallel wiring and battery bank voltage to get the MPPT and PWM amps needed, the cold-weather open-circuit voltage, the voltage class and PV fuse and breaker sizes.

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.

Estimate your annual carbon footprint from transportation, home energy, diet, and shopping. Get personalized reduction tips, visual breakdowns, and compare with national and global averages.

Find the minimum recommended cage size and safe bar spacing for your pet bird. Choose the species and how many birds live together to get welfare-based width, depth and height, a flock-scaled volume and a scaled cage diagram.

Work out your cat's daily calorie needs from weight, age, activity level and neutered status. Uses the veterinary RER formula with life-stage multipliers to suggest feeding amounts for both 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.

Estimate a dog's likely lifespan and remaining years from breed baseline, body size, current age, weight condition, activity, preventive and dental care, neuter status and chronic health burden, instead of a generic breed average.

Convert dog years to human years using modern veterinary guidelines. See your dog's equivalent human age, life stage, and health insights based on breed size.

Work out how much hay your horse needs each day from its body weight and activity level, as a percentage of body weight. See the daily ration in pounds or kilograms, flakes and bales per day, week and month, 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.

Find the IATA-compliant travel crate size for flying with a dog or cat. Enter body length, height to the elbow, shoulder width and standing height to get the minimum crate dimensions and the matching standard series from 100 to 700.

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.

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.

Decode JSON Web Tokens to read the header and payload claims without verifying the signature. Visualise the token structure, inspect claims, check expiry times and debug authentication issues entirely on your own device.

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.

Work out how many beads a necklace, bracelet or anklet needs from your pattern and finished length. Define a repeat of up to four bead types with sizes and colours, subtract the clasp, and get per-colour counts and 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.

Estimate how many skeins of embroidery floss a cross-stitch project needs from the stitch count, Aida count, strands used and stitch density. Gives thread length per stitch, total length and skeins to buy, with a waste buffer.

Work out the finished size of a cross-stitch project from your pattern stitch count and fabric count for Aida, evenweave or linen. Supports several fabric types, adds framing margins, and gives 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.

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

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.

Work out how many stitches to cast on and rows to knit for a sweater, scarf, blanket or any rectangular piece. Enter your gauge and finished width and length to get the cast-on count, total rows, a scaled diagram and a yarn estimate.

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.

Convert feet and inches to centimeters instantly with visual height comparison, multi-unit output (cm, meters, total inches), and common height reference examples.

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.

Convert inches to millimetres, including fractions like 3 1/2, 1/4 or 3/8 and mixed numbers. See the exact value on an aligned dual inch-and-mm ruler, plus cm, metres, thou and the nearest 1/16 inch. 1 inch = 25.4 mm exactly.

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.

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.

Convert stone and pounds to kilograms the way UK and Irish body weight is written. Enter whole stone plus pounds - 11 st 4 lb, say - for an exact weight in kilograms, grams, total pounds and decimal stone. Works both ways.

Convert tola to grams and between every traditional gold weight unit - tola, vori, masha, ratti, tael, Thai baht, cay, don, momme, troy ounce and more. Enter one amount to see all 22 units plus pure gold content at 24K to 18K.

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.

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.

Reverse your MP3 audio file instantly with our free online tool. Upload any MP3 file up to 10MB, preview both original and reversed audio with waveform visualization, and download the result. Privacy-focused - we never store your files.

Tap along to a song beat to measure its tempo in beats per minute (BPM) in real time. Includes tap stability, beat interval, tempo names, half-time and double-time controls, and a mobile-friendly tap pad.

Transpose chords, slash chords, and note lines from one musical key to another. Paste a chord chart, choose the original and target keys, and get a clean transposed version with sharps, flats, note maps, and chord changes.

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.

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.

Estimate the file size of a photo in JPEG, RAW, TIFF, HEIC, and PNG formats from megapixels, bit depth, and quality. See exactly how many photos fit on your SD card, SSD, or hard drive.

Find the Moon phase and illumination percentage for any past or future date. See a realistic lit Moon, its age in days, how far through the cycle it is, and the dates of the next New Moon, First Quarter, Full Moon and Last Quarter.

Estimate how well the stars will show tonight from your location. Combines the Bortle light-pollution scale with cloud cover, humidity and Moon phase for a 0-100 stargazing score, limiting magnitude and a live night-sky preview.

Calculate the sun's azimuth and elevation for any date, time and location. See it plotted on an interactive sky dome, trace the whole day's path, and get sunrise, solar noon, sunset, day length and shadow length.

Calculate sunrise, sunset, solar noon and day length for any location and date. See every twilight phase, the golden and blue hours, how fast day length is changing, and an animated sun-path arc with a day and night sky ribbon.

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.

Generate cryptographically secure SECRET_KEY values for Django projects with entropy analysis, character composition visualization, and one-click copy. Essential for Django security.

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.

Instantly identify network device manufacturers and vendors by MAC address. Search by full or partial MAC address, or look up MAC prefixes by company name with our comprehensive OUI database.

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.

Instantly discover your public IP address with detailed network information, IPv4/IPv6 detection, one-click copy, and connection details in a beautiful dashboard interface.

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.

Calculate the exact amount of wax needed for your candle container and determine the correct fragrance oil percentage. Features animated candle visualization, supports multiple wax types, container shapes, and batch calculations.

Work out how much epoxy resin and hardener to mix for your mould. Choose a shape, enter a known volume or use the water-weight method, and get resin and hardener in ml, fluid ounces and grams for any ratio, with a waste margin.

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.

Analyze password strength with real-time security scoring, entropy calculation, time-to-crack estimation, and detailed improvement suggestions. Test your password security instantly.

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.

Generate forex trading orders for 28 major currency pairs based on your currency strength analysis. Select LONG, SHORT, or NO ENTRY for each currency and get optimized trading signals.

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

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.