Get the numbers right
Everyday math
Add, subtract, multiply and divide for everyday jobs.
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- AbacusExplore a five-column decimal abacus by setting a value or moving the upper and lower bead groups.
- Bandwidth calculatorMultiply concurrent streams by each stream’s bitrate, then add your overhead allowance.
- Basic calculatorAdd, subtract, multiply and divide with parentheses, percentages and memory. Type, paste or use the keypad, then copy your answer.
- Big number calculatorAdd, subtract and multiply large decimals exactly, or divide them as a reduced exact fraction.
- Bill splitterSplit a bill equally in hundredths, allocating leftover cents to the number of people shown.
- Binary calculatorCalculate with signed binary whole numbers and see the exact binary and decimal results.
- Cake calculatorScale a round-pan recipe by the ratio of the two cylindrical batter volumes.
- Calculate edpiEffective DPI = mouse DPI × in-game sensitivity.
- Calculate GCFFind the greatest common factor and least common multiple.
- Calculate ppiPixels per inch = diagonal pixel count divided by diagonal size in inches.
- Camera data rate calculatorCalculate raw video payload = width × height × frames per second × bits per pixel.
- Coffee to water ratio calculatorScale a coffee recipe using the ratio you choose.
- Count cash denomination as you typeCount notes and coins, then total the cash in one currency.
- Cubic yards to tons calculatorConvert cubic yards to US short tons using the bulk density you supply.
- Darts calculatorScore one straight-in, double-out darts visit with automatic bust handling.
- Decimal to fraction calculatorConvert a finite decimal into an exact reduced fraction by dividing its integer digits by a power of ten.
- Discount calculatorSee the sale price and how much you save.
- Display size calculatorFind rectangular screen dimensions from diagonal and aspect ratio using the Pythagorean theorem.
- Display viewing angle calculatorCalculate the horizontal angle a flat screen fills: angle = 2 atan(width/(2 × distance)).
- Dough hydration calculatorFind baker’s hydration from total water and flour weights.
- Download time calculatorEstimate transfer time = file size in megabits ÷ effective megabits per second.
- Driving range calculatorEstimated range = usable fuel × average fuel economy.
- Engine compression ratio calculatorCalculate static compression ratio = (swept volume + clearance volume) ÷ clearance volume.
- Engine displacement calculatorCalculate engine displacement from circular bore area × stroke × cylinder count.
- Engine rpm calculatorFind engine rpm = road speed ÷ tire circumference × gearbox ratio × final drive.
- EV charging plannerEstimate energy and time for a battery charge change from capacity, efficiency and average input power.
- Factorial calculatorCalculate a factorial as an exact whole number.
- Feet inches calculatorCombine whole feet and extra inches, then show total inches, decimal feet and centimetres.
- Fraction calculatorAdd, subtract, multiply or divide fractions and mixed numbers.
- Fuel cost calculatorTrip fuel cost = miles ÷ miles per gallon × price per gallon.
- Gas mileage calculatorFuel economy in miles per gallon = miles traveled divided by gallons used.
- Gear ratio calculatorCalculate a gear-pair reduction from driven teeth ÷ driving teeth and find output speed.
- Geometric mean calculatorFind a multiplicative average without multiplying large products.
- Linear feet to square feet calculatorConvert a length of material to area: square feet = linear feet × width in inches ÷ 12.
- Long division calculatorDivide whole numbers with quotient, remainder and a digit-by-digit long-division trace.
- Love compatibility calculatorTry a playful two-name match. It is a game, not a prediction.
