Pythagorean Theorem Calculator

For a right triangle with legs a and b and hypotenuse c, use a² + b² = c². Enter two sides to find the third.

Enter two sides and leave the third empty.

a

b

c

Missing side

Tips: Leave exactly one of a, b, or c empty. All entered values must be positive.

FAQ

c is the hypotenuse, opposite the right angle. Legs a and b form the right angle.

Then the three positive values cannot form a right triangle with c as hypotenuse (for example, c must be greater than each leg when solving for c).

No. The Pythagorean theorem applies only to right triangles.