Math calculators

Arithmetic, percentages, fractions and a full scientific calculator.

Scientific CalculatorFull expression calculator with trig, logs, powers and roots.Percentage CalculatorPercent of a number, percentage change, and reverse percentages.Fraction CalculatorAdd, subtract, multiply and divide fractions, fully simplified.Random Number GeneratorRandom integers in any range, with or without repeats.

How to get a reliable answer

Every calculator on this page runs entirely in your browser, so nothing you type is sent to a server or stored. Enter your own figures rather than the defaults, check the units next to each field, and read the breakdown under the main result — it shows how the number was reached so you can sanity-check it against your own paperwork.