Math calculators

Type an expression and press Enter, add fractions exactly, or summarise a list of numbers. Each calculator explains its method with a worked example.

18 calculators

Scientific Calculator

Type any expression on your keyboard — Arabic digits work too.

X% of Y, what percent, percent change, discount and tip.

Add, subtract, multiply and divide fractions and mixed numbers.

Mean, median, mode, range and standard deviation of a list.

Solve direct and inverse proportions in one step.

Write amounts in Arabic (tafqeet) and English words.

Percentage increase or decrease from one value to another.

Difference between two values as a percent of their average.

Slope, angle, distance and line equation from two points.

Greatest common factor and least common multiple.

Solve ax² + bx + c = 0, including complex roots.

Sample and population standard deviation and variance, with every step.

Simplify a ratio, solve A:B = C:?, or split an amount by ratio.

Area, circumference, radius and diameter of a circle from any one value.

Z-score of a value and its percentile under the normal curve.

How many survey responses you need for a confidence level and margin of error.

nCr and nPr, with and without repetition, exact for large numbers.

Calculate sample and population variance, sum of squares, and step-by-step deviations.