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FREE TOOL
Ratio Calculator
Simplify ratios, scale them up or down, and find a missing value in a proportion.
:
Simplified Ratio
2 : 3
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Why Use Our Ratio Calculator?
Three Calculation Modes
Simplify a ratio, scale it by a multiplier, or find a missing value in a proportion - all in one tool.
Auto-Simplification
The simplify mode reduces any ratio to its lowest terms using the greatest common divisor automatically.
Scale Any Ratio
Enter a ratio and a multiplier to instantly see the scaled version. Useful for recipes, maps, and engineering plans.
Solve Proportions
The missing value mode solves A:B = C:? so you can find unknown values in proportional relationships.
Instant Results
Results update as you type with no button to press. Switch between modes without losing your inputs.
100% Private
All calculation happens in your browser. No data is sent to any server.
Frequently Asked Questions
How do I simplify a ratio?
Select the Simplify tab, enter A and B, and the calculator reduces the ratio to its lowest terms automatically.
How do I scale a ratio?
Select the Scale tab, enter your base ratio A:B and a multiplier. The scaled ratio is calculated instantly.
How do I find a missing value in a proportion?
Select the Find Missing tab and enter A, B, and C to solve A:B = C:?. The missing fourth value is calculated and displayed.
What is a ratio used for?
Ratios are used in cooking (scaling recipes), maps (scale factors), finance (financial ratios), and many other fields where two quantities are compared.
Can I use decimal numbers in a ratio?
Yes. The ratio calculator accepts decimal inputs in all fields. Results are shown with appropriate decimal precision.
Is the ratio calculator free?
Yes. Completely free with no sign-up required.
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View allMemory MatchClassic card-matching memory game with three difficulty levels. Tracks your moves and time, and saves your best score so you can try to beat it.Tic-Tac-ToePlay Tic-Tac-Toe against a friend or the computer. Choose an easy opponent or an unbeatable one, and track your win, loss, and draw record.HangmanClassic word-guessing game with Animals, Countries, Food, and Everyday Objects categories. Guess letters before you run out of tries.2048Slide and merge tiles to reach 2048. Play with arrow keys or swipe on mobile, and try to beat your best score.Word Search GeneratorGenerate a word search puzzle from a theme or your own word list, then click the first and last letter of a word to find it.SudokuPlay Sudoku with three difficulty levels. Every puzzle is generated with a guaranteed unique solution, with notes mode and a mistake checker.Daily WordA new 5-letter word puzzle every day. Guess the word in 6 tries, build your streak, and share your result.MinesweeperClassic Minesweeper with three difficulty levels. Your first click is always safe, flag mode works great on mobile, and your best time is saved.Sliding PuzzleThe classic 8-puzzle and 15-puzzle sliding tile games. Every shuffle is guaranteed solvable, with a move counter and best score saved.Lights OutClick a light to toggle it and its neighbors. Turn every light off to win, with three difficulty levels and your best move count saved.Simon SaysWatch the color and sound pattern, then repeat it back. Each round adds one more step. How many rounds can you remember?Reaction Time TestClick as fast as you can the moment the screen turns green. Catches false starts, tracks your average, and saves your best reaction time.Dots and BoxesTake turns drawing lines between dots. Complete the fourth side of a box to claim it and get an extra turn. Most boxes wins against the computer.Connect FourDrop pieces to connect four in a row before the computer does. The AI thinks several moves ahead, so it plays a genuinely strong game.MastermindCrack the hidden 4-color code in 10 guesses or fewer using black and white peg feedback. Tracks your wins, losses, and fewest guesses to solve.SnakeClassic arcade Snake. Steer with arrow keys or swipe on mobile, eat food to grow, and avoid the walls and your own tail. Best score saved.Tower of HanoiMove the whole stack of disks to the last peg in the fewest moves possible. Choose from 3 to 7 disks and compare against the mathematical minimum.
Developer Tools (8)
Password GeneratorGenerate strong, random passwords with custom length and character sets. Includes strength indicator and copy button.Base64 Encoder/DecoderEncode text or files to Base64 and decode Base64 strings back to plain text. Supports URL-safe mode.Number to WordsConvert any number into English words. Supports up to trillions, ordinal mode, and currency format.Screen Resolution CheckerCheck your screen resolution, viewport size, device pixel ratio, color depth, browser, and OS instantly.Aspect Ratio CalculatorCalculate the aspect ratio of any dimensions, or find a missing width or height from a known ratio.Vanishing Note - Self-Destructing NotesSend a secret note that self-destructs after being read. Encrypted in your browser, shared as a single-use link.Script SplitterPaste a long script and split it into copy-ready chunks of any character limit. Copy each part one at a time with a single click.Print PadA multi-page document editor with text formatting, tables, images, margins, and find and replace. Print or save as PDF straight from your browser.
Fun and Random (19)
View allDice RollerRoll any number of dice in any combination - d4, d6, d8, d10, d12, and d20. Instant results.Coin FlipperFlip a virtual coin and get heads or tails instantly. Flip multiple coins at once.Random Quote GeneratorGet a random inspirational quote with one click. Hundreds of famous quotes from history's greatest minds.Random Number GeneratorGenerate random numbers within any range. Generate multiple numbers and optionally keep them unique.Yes or No GeneratorCan't decide? Get a random yes or no answer instantly. Includes a maybe option for tough decisions.Keyboard TesterTest every key on your keyboard online. Choose from Windows full, TKL, 75%, 65%, 60%, Mac, and MacBook layouts.Dead Pixel TesterCheck your monitor for dead or stuck pixels using solid color screens. Red, green, blue, black, white, and more.Camera Shutter Count CheckerUpload a JPEG photo to check your camera's shutter count and view full EXIF camera details. Supports Canon and Nikon shutter count detection.Magic 8-BallAsk the Magic 8-Ball any yes-or-no question and shake it for an answer. All 20 classic responses, just like the original toy.Typing Speed TestTest your typing speed and accuracy with 10 different passages. Live WPM tracking and character-level feedback.Pros and Cons ListBuild a structured pros and cons list for any decision. See the balance at a glance, then copy or print your list.Baby Name GeneratorGenerate baby name ideas by gender, origin, starting letter, and meaning. Find the perfect name for boys, girls, or unisex.Username GeneratorGenerate unique username and gamertag ideas from your name or keywords. Choose a style and get instant results.Fantasy Name GeneratorGenerate fantasy names for characters, races, and places. Perfect for D&D, fiction writing, and worldbuilding.Business Name GeneratorGenerate creative business and brand name ideas from your keywords. Pick a style and get instant suggestions.New Year's Resolution TrackerSet New Year's resolutions, break them into milestones, and track your progress throughout the year.Spin the WheelAdd names, spin the wheel, and let it decide. Great for random picks, giveaways, and classroom activities.Random Team GeneratorPaste a list of names and split them into random, balanced teams instantly. Set the number of teams, add custom team names, and re-shuffle as many times as you like.Chore WheelBuild a weekly chore schedule for your household. Add people and tasks, then randomize assignments fairly or set them manually.
Design and Color (4)
Color ConverterConvert colors between HEX, RGB, HSL, and HSB formats instantly with a live color preview.Random Color GeneratorGenerate random colors with their HEX, RGB, and HSL values. Copy any format instantly.QR Code GeneratorGenerate a QR code from any URL or text. Download as PNG instantly. Free, private, no sign-up.Color Palette GeneratorGenerate harmonious color palettes from any base color. Complementary, analogous, triadic, and more.
Time Tools (6)
Alarm ClockFree online alarm clock. Set an alarm time and get a browser alert and sound when it goes off.Online TimerFree countdown timer. Set hours, minutes, and seconds and get an alert when the time is up.StopwatchFree online stopwatch with lap times. Start, stop, and reset with a single click.Time Zone ConverterConvert time between any two cities or time zones instantly. Great for scheduling across countries.Sleep CalculatorCalculate the best time to go to sleep or wake up based on 90-minute sleep cycles.Holiday CountdownLive countdowns to major holidays - Christmas, New Year, Thanksgiving, Halloween, and more.