Math Calculators

Pythagorean theorem.

Enter any two sides of a right triangle to calculate the third using a² + b² = c². Updates as you type.

Inputs

Leave one field blank — the calculator solves for it. Sides a and b are the legs; c is the hypotenuse.

Result

Enter two sides above to solve for the third.

About the Pythagorean theorem

The Pythagorean theorem describes the relationship between the three sides of a right triangle. The square of the hypotenuse equals the sum of the squares of the other two sides: a² + b² = c². It applies only to triangles with one 90° angle and is widely used in construction, navigation, surveying, computer graphics, and physics.