A universe of useful calculators.
Maths calculators that show their working.
Get the answer, formula and steps—without an account, paywall or clutter.
Choose a calculatorCalculator library
Start with the problem in front of you
Ten focused tools covering everyday arithmetic, school maths, algebra and statistics.
Percentage CalculatorSolve the three percentage questions people use most, with the working shown.Fraction CalculatorCalculate with two fractions and reduce the exact answer to lowest terms.Average CalculatorEnter a data set to calculate its key averages and spread.Scientific CalculatorEvaluate a scientific expression safely without downloading an app.Grade CalculatorTurn points earned into a percentage and indicative letter grade.Standard Deviation CalculatorMeasure how far a set of values spreads around its mean.Quadratic Formula CalculatorFind both roots of a quadratic equation and see how the discriminant determines them.Triangle CalculatorEnter three side lengths to solve the triangle completely.Square Root CalculatorFind a decimal square root and an exact simplified radical when possible.Random Number GeneratorGenerate up to 100 random whole numbers inside your chosen range.
10focused calculators
0accounts or uploads
100%browser-based