Pythagorean Theorem Calculator

What Is a Pythagorean Theorem Calculator?

The Pythagorean Theorem Calculator calculates the longest side (hypotenuse) of a right-angled triangle given the two shorter sides (legs). It is based on the famous theorem: a² + b² = c². This free online tool is useful for Pythagorean theorem calculator, right triangle calculator, hypotenuse calculator. Common use cases include right-triangle geometry, construction, surveying, engineering, and finding a missing hypotenuse. It is designed for quick browser-based calculations and is suitable for homework, programming, study, everyday math, and checking results.