Pythagorean Theorem Calculator
Calculate the third side of a right triangle when two sides are known. Calculate hypotenuse or leg length with triangle visualization.
Select Calculation Type
Choose which side to calculate.
Find Hypotenuse (Calculate c from a and b)
Enter lengths of both sides:
c² = a² + b²
Pythagorean Theorem: a² + b² = c²
Pythagorean Theorem
In a right triangle, the Pythagorean theorem states that the square of the hypotenuse (c) is equal to the sum of squares of the two legs (a, b). c² = a² + b²