📐 Pythagorean Theorem
Find any side of a right triangle with a² + b² = c²
About this calculator
The Pythagorean Theorem calculator solves right triangles using a squared plus b squared equals c squared. Enter any two sides — the two legs or one leg and the hypotenuse — and it finds the missing side. It also verifies whether three lengths form a right triangle. Carpenters, navigators, and students use it constantly for diagonals and distances.
Tip: when squaring large numbers, keep full precision until the final square root — rounding mid-calculation is the most common source of close-but-wrong answers.