📐 Pythagorean Theorem Calculator
Enter the lengths of the two legs of a right triangle to find the hypotenuse using the Pythagorean theorem.
What this calculator does
This tool finds the length of the hypotenuse (the longest side) of a right triangle when you know the lengths of the other two sides, called legs. It also estimates the two acute angles of the triangle.
The Pythagorean theorem
The theorem states that a² + b² = c², where a and b are the two legs and c is the hypotenuse. Rearranging for c gives c = √(a² + b²), which is the formula used here. The angles are then found using inverse sine on the ratio of each leg to the hypotenuse.
Good to know
This calculator assumes a true right triangle (one 90-degree angle). Use the same unit of measurement for both legs so the hypotenuse comes back in that same unit. Intended for general educational and planning use.