What does this calculator solve?

The Pythagorean theorem, a² + b² = c². It finds the hypotenuse c from two legs, or a missing leg from the hypotenuse and the other leg.

Why does it say the hypotenuse must be longer than the leg?

In a right triangle the hypotenuse is always the longest side, so solving for a leg requires the hypotenuse to be greater than the known leg — otherwise no real triangle exists.

Is anything uploaded?

No — every calculation runs entirely in your browser and nothing is sent anywhere.

Pythagorean Theorem Calculator

Solve a² + b² = c² for the hypotenuse or a missing leg.

Pythagorean theorem calculator

Solve a² + b² = c² in either direction. Find the hypotenuse from the two legs, or find a missing leg from the hypotenuse and the other leg. The formula used is shown alongside each result so you can follow the working.

When solving for a leg, the calculator checks that the hypotenuse is the longest side, since no real right triangle exists otherwise. Everything runs in your browser — nothing is uploaded.