Math Tools

Free online calculators and converters to help you solve math problems quickly.

Calculate percentages, increases, and decreases

Find greatest common factor and least common multiple

Reduce fractions to lowest terms

Convert between decimals and fractions

Add, subtract, multiply, and divide fractions

Plot and visualize linear equations

Solve quadratic equations ax² + bx + c = 0

Calculate angles, sides, area, and perimeter

Explore trigonometric values on the unit circle

Full-featured scientific calculator

Calculate mean, median, mode, and standard deviation

Solve 2x2 systems of linear equations

Calculate area and volume of shapes

Convert between different units of measurement

Want to learn more?

Explore our interactive lessons for step-by-step explanations.