Pythagorean Theorem Calculator

Pythagorean Theorem Calculator is a clean, fast tool for solving right triangles — completely offline. Enter any two sides and it instantly finds the third using a² + b² = c², then works out the rest of the triangle for you.

WHAT YOU CAN DO
• Solve for the hypotenuse c from the two legs a and b
• Solve for a missing leg from the other leg and the hypotenuse
• See the two acute angles, the area and the perimeter
• Get the altitude to the hypotenuse
• Watch a live, to-scale diagram of your triangle with labelled sides

PYTHAGOREAN TRIPLES
A built-in Examples tab lists the classic whole-number triples — 3-4-5, 5-12-13, 8-15-17 and 7-24-25. Tap any one to load it straight into the calculator.

LEARN AS YOU GO
The Learn tab explains, in plain language, what the Pythagorean theorem says, what a right triangle is, and when the theorem applies — so the numbers actually make sense.

CLEAR, NOT CLEVER
Inputs are validated with friendly messages: values must be positive, and a leg must be shorter than the hypotenuse. You get a helpful note instead of a wrong answer or a crash.

ACCURACY NOTE
Results are computed from the values you type. Always double-check your measurements before relying on them for construction, fabrication or other important work. This app is intended for general and educational use.

PRIVACY
The app collects no personal data and works fully offline — your numbers never leave your device. Ads are served by Google AdMob, which may use an advertising identifier as described in Google's policies.

Light and dark themes, a tiny download, and no clutter. Download Pythagorean Theorem Calculator and solve right triangles with confidence.