Pythagorean Theorem Calculator
Calculate the hypotenuse of a right triangle using the Pythagorean theorem (a² + b² = c²).
How to use this tool
- Enter side a and side b in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your hypotenuse c and the full breakdown beneath it.
Find the hypotenuse of a right triangle: c = √(a² + b²).
Frequently asked questions
- What is the Pythagorean theorem?
- For a right triangle with legs a and b, the hypotenuse c satisfies a² + b² = c². Classic example: 3² + 4² = 9 + 16 = 25 = 5².