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Pythagorean Theorem Calculator
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Enter any two sides of a right triangle to find the third.
| Leg a | 3 |
| Leg b | 4 |
| Hypotenuse c | 5 |
The Pythagorean Theorem
For any right triangle, the square of the hypotenuse (the side opposite the right angle) equals the sum of the squares of the other two sides, called the legs. Leave whichever side you don't know blank - the calculator will figure out from the two you provide whether you're solving for the hypotenuse or for a leg.
a² + b² = c²
c is always the hypotenuse - the longest side, opposite the right angle