Free Online Tools

Calculate percentages, percent change, increase, decrease, difference, discount, markup, markdown, tax, tips, and equal bill splits.

Estimate fixed-rate mortgage payments, total interest, upfront cash, payoff date, extra-payment savings, and a complete amortization schedule.

Calculate a fixed-rate monthly loan payment, total interest, payoff date, extra-payment savings, and amortization schedule.

Project compound growth from an initial investment, recurring contributions, a nominal annual rate, and daily, monthly, quarterly, or yearly compounding.

Project portfolio growth with monthly contributions, fees, inflation, contribution increases, and lower, base, and higher return scenarios.

Estimate platform payout, fee leakage, tax reserves, or the gross sales needed to reach a target take-home amount.

Convert gross pay between hourly, daily, weekly, biweekly, semi-monthly, monthly, and annual equivalents using a custom work schedule.

Calculate gross profit, gross margin, markup, cost share, or the selling price required for a target margin or markup.

Add tax to a price or remove included tax to recover the original price and tax amount.

Project savings at retirement, estimate an inflation-adjusted required balance, and test whether withdrawals last through a selected age.

Project a savings balance from an opening deposit, monthly contributions, APY or nominal interest, contribution timing, and term.

Compare U.S. dollar purchasing power with annual CPI-U data or project a future amount using a custom inflation or deflation rate.

Estimate how long a credit-card balance will take to repay or calculate the monthly payment required for a target timeline.

Estimate APR for a fixed-rate installment loan by including prepaid finance charges that reduce the amount financed.

Estimate the direct labour cost and person-hours of one-time or recurring meetings using multiple salary groups, overhead, preparation, and follow-up.

Compare EV electricity and gasoline costs using real efficiency, home and public charging prices, losses, annual driving, and break-even rates.

Calculate percentages, percent change, increase, decrease, difference, discount, markup, markdown, tax, tips, and equal bill splits.

Estimate platform payout, fee leakage, tax reserves, or the gross sales needed to reach a target take-home amount.

Convert gross pay between hourly, daily, weekly, biweekly, semi-monthly, monthly, and annual equivalents using a custom work schedule.

Calculate gross profit, gross margin, markup, cost share, or the selling price required for a target margin or markup.

Add tax to a price or remove included tax to recover the original price and tax amount.

Estimate the direct labour cost and person-hours of one-time or recurring meetings using multiple salary groups, overhead, preparation, and follow-up.

Add elapsed or business hours to a start time, skip custom non-working days and holidays, apply paused time, and export the deadline.

Search USDA foods and calculate calories, macros, vitamins, and minerals for any gram weight or listed serving size.

Calculate exact age in years, months, and days, total time elapsed, and the date and weekday of the next birthday.

Calculate adult BMI, view its screening category, and see the weight interval corresponding to the selected thresholds.

Calculate bedtime, wake-up time, sleep duration, or a wake-up time from now, with your own sleep target and fall-asleep estimate.

Estimate adult body-fat percentage, fat mass, fat-free mass, FFMI, and BMI using circumference measurements or an adult BMI regression.

Convert milligrams, grams, kilograms, metric tonnes, avoirdupois ounces, pounds, and stone.

Convert US butter sticks into grams, ounces, cups, tablespoons, and teaspoons for baking and recipe conversions.

Convert active dry, instant, and fresh yeast between packets, grams, teaspoons, and weight ounces.

Scale an ingredient list for more or fewer servings, including fractions, mixed numbers, decimals, and ranges.

Calculate dough hydration while correctly including the flour and water inside your starter or levain.

Calculate flour, water, salt, yeast, and oil for any number and weight of pizza dough balls.

Calculate coffee or brewing water from an editable ratio, batch size, or number of servings.

Convert milliliters to grams for flour, sugar, butter, water, oil, honey, and other common cooking ingredients.

Convert grams to US cups, tablespoons, teaspoons, and millilitres using ingredient-specific baking weights.

Calculate how much batter you need when changing between round, square, or rectangular cake pans.

Convert vegetable oil to a practical melted-butter substitution in US cups, sticks, tablespoons, and grams.

Estimate alcohol by volume and apparent attenuation from original and final gravity readings.

Calculate milk fat, MSNF, added sugar, and total solids for a simple milk, cream, sugar, and skim-milk-powder base.

Estimate donuts per guest, reserve, full boxes, box overage, and an even variety split for an event.

Calculate the estimated water needed to reduce a spirit or alcohol solution to a lower target ABV.

Search USDA foods and calculate calories, macros, vitamins, and minerals for any gram weight or listed serving size.

Convert temperature values between Celsius, Fahrenheit, Kelvin, and Rankine with absolute-zero validation.

Convert milligrams, grams, kilograms, metric tonnes, avoirdupois ounces, pounds, and stone.

Convert litres, millilitres, cubic units, US liquid units, Imperial units, and clearly labelled cooking cups.

Calculate how much uncooked dry or fresh pasta you need for any number of people.

Calculate the exact probability that at least two people share a birthday and find the group sizes needed for common probability thresholds.

Calculate percentages, percent change, increase, decrease, difference, discount, markup, markdown, tax, tips, and equal bill splits.

Find a missing leg or hypotenuse, verify a right triangle, and see the complete calculation.

Convert numbers to Roman numerals or decode Roman numerals into numbers with canonical validation and a clear value breakdown.

Calculate a circle's area, circumference, radius, and diameter from any one known measurement.

Calculate radius, diameter, great-circle circumference, surface area, and volume from any one sphere measurement.

Calculate sample or population standard deviation, variance, mean, range, sum of squares, and every deviation from the mean.

Calculate mean, median, mode, range, sum, count, minimum, maximum, and exact-value frequencies from a list of numbers.

Evaluate real-number expressions with trigonometry, logarithms, powers, roots, factorials, percentages, DEG/RAD modes, scientific notation, keyboard input, and Ans.

Generate random integers or fixed-decimal numbers from a custom range, with optional uniqueness and sorting.

Convert milliliters to grams for flour, sugar, butter, water, oil, honey, and other common cooking ingredients.

Convert grams to US cups, tablespoons, teaspoons, and millilitres using ingredient-specific baking weights.

Convert px, em, and rem using separate local and root font-size contexts, with CSS-ready output and optional batch conversion.

Convert feet to inches or swap the direction to convert inches to feet, with clean results rounded to three decimal places.

Convert newtons, kilonewtons, pound-force, kilogram-force, dynes, and ounce-force instantly in either direction.

Convert Pa, hPa, kPa, MPa, bar, mbar, psi, atm, Torr, mmHg, and inHg in either direction.

Convert light-years, metres, kilometres, miles, astronomical units, and parsecs in either direction.

Convert temperature values between Celsius, Fahrenheit, Kelvin, and Rankine with absolute-zero validation.

Convert millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, and nautical miles.

Convert milligrams, grams, kilograms, metric tonnes, avoirdupois ounces, pounds, and stone.

Convert litres, millilitres, cubic units, US liquid units, Imperial units, and clearly labelled cooking cups.

Convert square metres, square feet, acres, hectares, square kilometres, square miles, and other area units.

Convert kilometres per hour, miles per hour, metres per second, knots, and feet per second in either direction.

Calculate raised-bed soil volume, bags, bulk cubic yards, fill and settling allowances, mix quantities, and optional delivery weight.

Measure small objects on screen in millimetres, centimetres, and inches, with horizontal, vertical, fullscreen, and card-calibrated actual-size modes.

Calculate exact age in years, months, and days, total time elapsed, and the date and weekday of the next birthday.

Calculate bedtime, wake-up time, sleep duration, or a wake-up time from now, with your own sleep target and fall-asleep estimate.

Count calendar days, Monday-to-Friday weekdays, weekends, and exact weeks between two dates, with optional end-date inclusion.

See exactly how long is left until Christmas 2026 with a live countdown showing days, hours, minutes, and seconds in your local time.

Add elapsed or business hours to a start time, skip custom non-working days and holidays, apply paused time, and export the deadline.

Estimate fixed-rate mortgage payments, total interest, upfront cash, payoff date, extra-payment savings, and a complete amortization schedule.

Estimate CO₂e from travel and household energy using sourced 2026 UK reference factors.

Convert millimetres, centimetres, metres, kilometres, inches, feet, yards, miles, and nautical miles.

Convert litres, millilitres, cubic units, US liquid units, Imperial units, and clearly labelled cooking cups.

Convert square metres, square feet, acres, hectares, square kilometres, square miles, and other area units.

Convert kilometres per hour, miles per hour, metres per second, knots, and feet per second in either direction.

Estimate aquarium volume for fancy, common, comet, or shubunkin goldfish and compare an existing tank.

Estimate daily raw-food grams from a French Bulldog's calorie target, food energy density, meal count, and other daily calories.

Compare EV electricity and gasoline costs using real efficiency, home and public charging prices, losses, annual driving, and break-even rates.

Calculate raised-bed soil volume, bags, bulk cubic yards, fill and settling allowances, mix quantities, and optional delivery weight.

Calculate usable RAID capacity, parity or mirror overhead, hot-spare reserve, efficiency, binary capacity, and disk-failure tolerance.

Find an IPv4 network address, CIDR block, subnet mask, broadcast boundary, usable range, wildcard mask, and binary breakdown.

Convert px, em, and rem using separate local and root font-size contexts, with CSS-ready output and optional batch conversion.

Pick colors visually, from a local image or supported screen eyedropper. Inspect source pixels, convert HEX/RGB/HSL/HSV, check WCAG contrast, and export CSS or JSON.

Generate 1, 5, or 10 cryptographically random passwords locally with adjustable length, character sets, and ambiguity filtering.

Convert text, Unicode characters, and emoji into grouped UTF-8 binary and hexadecimal bytes.

Create free static QR codes for URLs, Wi-Fi, vCards and more with logos, custom styling, PNG/SVG export, and no account, redirect, expiry, watermark, or scan limit.

Convert JSON, nested API responses, JSONL, and NDJSON to CSV or Excel with row-source selection, column preview, and browser-local file processing.

Validate UTF-8 CSV structure, detect spreadsheet conversion hazards, and export auditable repairs without coercing identifiers, numbers, or dates.

Scan text for configured sensitive patterns, optionally redact matches, estimate a broad token range, and export ordered context chunks.

Generate favicon.ico, PNG favicons, Apple touch icons, regular and maskable PWA icons, a web manifest, HTML links, and deployment notes.

Generate SHA-256, SHA-384, or SHA-512 locally and compare files or text with a published checksum.

Black out private areas of a screenshot with opaque replacement pixels and inspect the encoded PNG before downloading.

Generate Lorem Ipsum by paragraphs, sentences, exact words, characters, UTF-8 bytes, or lists, then copy or download text, HTML, or Markdown.

Pick colors visually, from a local image or supported screen eyedropper. Inspect source pixels, convert HEX/RGB/HSL/HSV, check WCAG contrast, and export CSS or JSON.

Instantly check your browser-reported screen resolution, live viewport, aspect ratio, device pixel ratio, estimated device pixels, color depth, and touch support.

Play a cautious 60-second low-frequency cycle for a phone speaker that sounds muffled after water exposure.

Open a fullscreen white or custom color screen for display checks, cleaning, lighting, and tracing, then generate exact-size solid-color PNGs locally.

Measure small objects on screen in millimetres, centimetres, and inches, with horizontal, vertical, fullscreen, and card-calibrated actual-size modes.

Calculate usable RAID capacity, parity or mirror overhead, hot-spare reserve, efficiency, binary capacity, and disk-failure tolerance.

Convert images or a live camera feed into copyable ASCII art with adjustable detail, character styles, color, PNG and TXT exports.

Pick colors visually, from a local image or supported screen eyedropper. Inspect source pixels, convert HEX/RGB/HSL/HSV, check WCAG contrast, and export CSS or JSON.

Create free static QR codes for URLs, Wi-Fi, vCards and more with logos, custom styling, PNG/SVG export, and no account, redirect, expiry, watermark, or scan limit.

Open a fullscreen white or custom color screen for display checks, cleaning, lighting, and tracing, then generate exact-size solid-color PNGs locally.

Compress JPG/JPEG, PNG, WebP, AVIF, HEIC, and HEIF locally with Target KB, per-image controls, before-and-after comparison, and ZIP downloads.

Convert static JPG, PNG, and WebP images locally with quality and transparency controls, before-and-after comparison, and ZIP downloads.

Check and resize JPG, PNG or WebP images against online-form requirements for file size, pixels, format, aspect ratio and DPI.

Convert JSON, nested API responses, JSONL, and NDJSON to CSV or Excel with row-source selection, column preview, and browser-local file processing.

Combine JPG, JPEG and PNG images into one PDF locally with reorder, rotation, page-size and margin controls.

Validate UTF-8 CSV structure, detect spreadsheet conversion hazards, and export auditable repairs without coercing identifiers, numbers, or dates.

Scan text for configured sensitive patterns, optionally redact matches, estimate a broad token range, and export ordered context chunks.

Generate favicon.ico, PNG favicons, Apple touch icons, regular and maskable PWA icons, a web manifest, HTML links, and deployment notes.

Generate SHA-256, SHA-384, or SHA-512 locally and compare files or text with a published checksum.

Black out private areas of a screenshot with opaque replacement pixels and inspect the encoded PNG before downloading.

Convert numbers to Roman numerals or decode Roman numerals into numbers with canonical validation and a clear value breakdown.

Convert supported English text to uncontracted Unicode Braille or decode the documented Braille subset back to English, then copy the result and inspect its dot patterns.

Convert images or a live camera feed into copyable ASCII art with adjustable detail, character styles, color, PNG and TXT exports.

Convert text, Unicode characters, and emoji into grouped UTF-8 binary and hexadecimal bytes.

Practise touch typing with adaptive weak-key lessons, honest first-attempt accuracy, mastery-based letter unlocking, and local per-key progress.

Create free static QR codes for URLs, Wi-Fi, vCards and more with logos, custom styling, PNG/SVG export, and no account, redirect, expiry, watermark, or scan limit.

Translate text to International Morse code or decode written dots and dashes, then copy or play the result without an account.

Scan text for configured sensitive patterns, optionally redact matches, estimate a broad token range, and export ordered context chunks.

Shuffle names, tasks, topics, numbers, or any line-separated list into a new random order.

Generate 1 to 50 unique words from a curated English list or paste your own list for custom random picks.

Generate Lorem Ipsum by paragraphs, sentences, exact words, characters, UTF-8 bytes, or lists, then copy or download text, HTML, or Markdown.

Generate random Pictionary words with a built-in timer, private clue reveal, kids and adult filters, difficulty levels, categories, fullscreen, and no repeats during the session.

Calculate the exact probability that at least two people share a birthday and find the group sizes needed for common probability thresholds.

Flip a coin online for an instant Heads or Tails result. Tap once, or use Settings for multiple flips, custom choices, and simple session stats.

Spin an animated bottle to choose a random direction, or add 2–12 player names and let the bottle pick one person.

Place 2–10 fingers on one touchscreen and randomly choose one person for games, turns, chores, and quick group decisions—no app install needed.

Add names or choices, spin the wheel, save reusable wheels locally, keep or remove winners, and review recent results.

Enter names, spin a full-screen animated wheel, and reveal one random winner with optional sound and celebration effects.

Split a list of names into balanced random teams, pairs, or groups with custom team names, random leaders, CSV export, and shareable links.

Shuffle names, tasks, topics, numbers, or any line-separated list into a new random order.

Generate random integers or fixed-decimal numbers from a custom range, with optional uniqueness and sorting.

Roll 1 to 10 animated six-sided dice online for board games, classrooms, probability activities, and quick random results.

Generate 1 to 50 unique words from a curated English list or paste your own list for custom random picks.

Generate Lorem Ipsum by paragraphs, sentences, exact words, characters, UTF-8 bytes, or lists, then copy or download text, HTML, or Markdown.

Generate random Pictionary words with a built-in timer, private clue reveal, kids and adult filters, difficulty levels, categories, fullscreen, and no repeats during the session.

Keep score for two teams or players with editable names, optional rounds or sets, fullscreen, four themes, and local autosave.

Convert Minecraft coordinates between the Overworld and Nether with exact positions, whole-block targets, and correct negative-coordinate rounding.

Calculate Minecraft pyramid blocks from height, base width, or a block budget. Compare hollow and solid builds, stacks, shulkers, and tiers.

Estimate a Java Edition stronghold target by intersecting two Eye of Ender readings from their decimal X, Z, and F3 yaw values.

Convert Minecraft items into stacks and storage, convert stacks back into items, or calculate chest, shulker, and inventory capacity.

Run a day-by-day humans-versus-zombies simulation with editable strategies, outbreak charts, milestones, and transparent population maths.

Estimate area-equivalent wall and roof pieces for a brick house model, including openings, scale, wall layers, spares, weight, and budget.

Build a mixed Rust raid path and compare C4, rockets, satchels, explosive ammo, sulfur, components, workbench limits, and safety buffers.

Estimate harvests, seed spending, raw crop revenue, jar or keg value, and net profit across a Stardew Valley growing window.

Flip a coin online for an instant Heads or Tails result. Tap once, or use Settings for multiple flips, custom choices, and simple session stats.

Spin an animated bottle to choose a random direction, or add 2–12 player names and let the bottle pick one person.

Place 2–10 fingers on one touchscreen and randomly choose one person for games, turns, chores, and quick group decisions—no app install needed.

Add names or choices, spin the wheel, save reusable wheels locally, keep or remove winners, and review recent results.

Split a list of names into balanced random teams, pairs, or groups with custom team names, random leaders, CSV export, and shareable links.

Roll 1 to 10 animated six-sided dice online for board games, classrooms, probability activities, and quick random results.

Test how quickly you react to a visual signal with a simple browser-based reaction time test.

Generate 1 to 50 unique words from a curated English list or paste your own list for custom random picks.

Generate random Pictionary words with a built-in timer, private clue reveal, kids and adult filters, difficulty levels, categories, fullscreen, and no repeats during the session.

Tune guitar, bass, or ukulele with microphone pitch detection, exact cents, alternate tunings, and custom string targets.

Translate text to International Morse code or decode written dots and dashes, then copy or play the result without an account.

Play a cautious 60-second low-frequency cycle for a phone speaker that sounds muffled after water exposure.