Math calculators

Math calculators for homework, work and everyday questions: a full scientific calculator, exact fraction arithmetic, every kind of percentage problem, a triangle solver, standard deviation and a fair random number generator.

Most of them show their working step by step, so you can check the method as well as the answer.

Percentage Calculator
Every common percentage question, with the working shown.
Scientific Calculator
Trig, logs, powers, roots and memory, with keyboard support.
Fraction Calculator
Add, subtract, multiply, divide and simplify fractions.
Random Number Generator
Pick random whole numbers or decimals in any range.
Triangle Calculator
Solve any triangle from three sides or angles.
Standard Deviation Calculator
Mean, variance and standard deviation of a list of numbers.

More calculator categories

Everyday Money· 3Quick answers for bills, tips and splitting costs.
Shopping· 1Work out what you actually pay at the till.
Education· 1Grades, credits and academic averages.
Date & Time· 2Count days, plan deadlines and compare dates.
Health· 1Everyday health numbers, explained in plain language.