← All toolsMath & Science›Geometry
Pythagorean Theorem Calculator
Find the missing side of a right triangle with a² + b² = c².
Tip from Tink: Builders use 3-4-5 measurements to check a corner is square.
a
3
b
4
c
5
Area
6
Advertisement
Add this tool to your website
Free to embed on any blog or site.
How to use the Pythagorean Theorem Calculator
- Enter the two sides you know.
- Put 0 in the side you want to find.
- Read the missing side.
Everything runs in your browser. Nothing you enter is uploaded.