Welcome to this Pythagorean Theorem Calculator

This is a calculator to determine the missing side length on any right triangle

Please enter your two known side lengths in any order, we will call them a, b, and c, below:

First length:    Second length:   


What would you like to solve for:

Hypotenuse
Leg



What is the Pythagorean Theorem?? What does it do??


This formula connects the length of the legs of a right triangle to its hypotenuse.
Therefore, if we have two side lengths, we can always find the remaining leg. It is extremely useful.
a² + b² = c²

Please watch the below video for a proof