Maths Calculators
Everyday maths — percentages, fractions, ratios, averages, standard deviation and more. All update live as you type.
Tools & checkers
All calculators →Percentage Calculator
% of a number, % change, X is what % of Y.
Start checkFraction Calculator
Add, subtract, multiply, divide and simplify fractions.
Start checkRatio Calculator
Simplify ratios and solve A:B = C:?.
Start checkAverage / Mean / Median / Mode
Mean, median, mode and range from a list of numbers.
Start checkStandard Deviation Calculator
Sample and population SD, variance, mean.
Start checkQuadratic Equation Solver
Roots of ax²+bx+c=0 with discriminant.
Start checkRandom Number Generator
Generate random integers in a chosen range.
Start checkUnit Converter
Length, weight and temperature unit conversions.
Start checkPopular questions
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