Pythagorean Theorem Calculator
Enter the two sides you know and choose the one to find.
What is the Pythagorean theorem?
In a right-angled triangle the square of the hypotenuse (the longest side) equals the sum of the squares of the other two: a² + b² = c². With legs 3 and 4 the hypotenuse is √25 = 5. To find a leg, rearrange to a = √(c² − b²).
Solve more general equations with the Quadratic Equation Solver.
Frequently asked questions
How do you find the hypotenuse?
Square both shorter sides, add them and take the square root: c = √(a² + b²).
How do you find a missing leg?
Subtract the square of the known leg from the square of the hypotenuse, then take the square root.
What are Pythagorean triples?
Whole-number sets that satisfy a² + b² = c², such as 3-4-5, 5-12-13 and 8-15-17.
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