Math tools

Unit Converter

Convert between metric and imperial units for length, mass, volume, area, temperature, speed, time and digital storage.

Free, no sign-up Works in your browser

Convert

Measurement

Amount

From

3.28084

Foot

Ratio Calculator

Simplify, scale, solve

Proportion Calculator

Solve a/b = c/x

Algebra Calculator

Solve for x, step by step

Quadratic Equation Solver

Roots, discriminant, vertex

Prime Number Checker

Prime test & factors

LCM Calculator

Lowest common multiple