Pythagorean Theorem Calculator

Right triangle: a² + b² = c². Enter any two sides — solve for the third.

Result

Hypotenuse c

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Area

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Perimeter

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The formula

a² + b² = c²

Where c is the hypotenuse (the side opposite the right angle) and a, b are the two legs.

Classic Pythagorean triples

Whole-number triangles: 3-4-5, 5-12-13, 8-15-17, 7-24-25. Multiples work too — 6-8-10, 9-12-15, etc.