The Pythagorean theorem states that in a right triangle, A² + B² = C², where C is the hypotenuse. This calculator uses that formula to find the missing side when you provide any two sides. Enter exactly two sides and leave one blank, and the calculator solves for the unknown using algebra.
A set of three whole numbers that satisfy A² + B² = C². Examples: 3-4-5, 5-12-13, and 8-15-17.
This calculator only works for right triangles (with one 90° angle). For other triangles, use the Law of Cosines.
Most combinations of side lengths don't produce whole numbers. Decimals are accurate; only integer results form Pythagorean triples.
Estimate only. Results reflect your inputs and standard formulas. Double-check important decisions independently.