Right Triangle Calculator

Calculate a missing side of a right triangle using the Pythagorean theorem.

Right Triangle Calculator helps you find the hypotenuse or a missing leg with Pythagoras. Enter leg a, leg b, and hypotenuse c, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Right triangle calculator does Right Triangle Calculator is built for arithmetic, algebra, geometry, and number tools. Find the hypotenuse or a missing leg with Pythagoras. You enter leg a, leg b, and hypotenuse c, then Simple Calculators computes the result instantly. Results use standard school and engineering formulas that run privately in your browser. How the math works c² = a² + b². Solve for the missing side by rearranging. The formula: a² + b² = c². a and b are the two sides that meet at the right angle; c is the hypotenuse (the longest side).