Solve a right triangle with the Pythagorean theorem, which says the square of the hypotenuse equals the sum of the squares of the two legs, written as a squared plus b squared equals c squared. Choose whether you are finding the long hypotenuse from two legs, or a missing leg from one leg and the hypotenuse. For legs of 3 and 4 the hypotenuse is 5, one of the most famous whole number triples. When solving for a leg the tool subtracts before taking the square root and warns you if the hypotenuse you entered is too short to be valid. This theorem underpins distance, navigation, construction squaring, and screen diagonals. Enter your two known sides in a consistent unit and the missing side returns in that same unit. Everything is computed locally in your browser at full precision, and the answer copies with one click.
In a right triangle the square of the hypotenuse equals the sum of the squares of the two legs, written a squared plus b squared equals c squared.
Yes. Enter the hypotenuse and one leg and the tool solves for the other leg.
The hypotenuse is the longest side, opposite the right angle.
Solve a right triangle with the Pythagorean theorem, which says the square of the hypotenuse equals the sum of the squares of the two legs, written as a squared plus b squared equals c squared. Choose whether you are finding the long hypotenuse from two legs, or a missing leg from one leg and the hypotenuse.
Yes. Pythagorean Theorem Calculator is completely free, with no sign-up and no usage limits.
Yes. Pythagorean Theorem Calculator runs in any modern web browser. There is nothing to download or install.
Yes. Pythagorean Theorem Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.