Pythagorean Theorem Calculator
Solve for any side of a right triangle using a² + b² = c². Instantly calculates sides, angles, area, and perimeter.
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Enter two sides to calculate the third
About the Pythagorean Theorem
The Pythagorean theorem is one of the most famous equations in mathematics: a² + b² = c². It describes the relationship between the three sides of any right triangle, where c is the hypotenuse (the side opposite the 90° angle).
a² + b² = c²
Find c (hypotenuse)
c = √(a² + b²)
Find a (leg)
a = √(c² − b²)
Find b (leg)
b = √(c² − a²)