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Math Calculators

These math tools handle the calculations people run into at school, at work and around the house: percentage change, fractions, descriptive statistics, triangle measurements and general scientific arithmetic.

Each calculator shows its formula and a worked example so you can check the logic and learn the method rather than only copy an answer.

Percentage CalculatorThree common percentage problems solved at once.Fraction CalculatorAdd, subtract, multiply or divide two fractions.Average & Standard DeviationMean, median, mode and spread for a list of numbers.Right Triangle CalculatorHypotenuse, area and angles from the two legs.Random Number GeneratorGenerate secure random numbers in any range.Scientific CalculatorFull-featured scientific calculator with keyboard input.

How to choose the right calculator

Study and check your work

Run an example by hand first, then use the calculator to verify it and read the explanation for any step that differs.