Pythagorean Theorem Calculator

Calculate the missing side of a right triangle using the Pythagorean theorem. Find hypotenuse or legs with step-by-step solutions.

Pythagorean Theorem Calculator

Enter any two sides of a right triangle to calculate the third side using the Pythagorean theorem: a² + b² = c²

Common Examples

3-4-5 Triangle
a=3, b=4 → c=5
5-12-13 Triangle
a=5, b=12 → c=13
1-1-√2 Triangle
a=1, b=1 → c=√2
1-2-√5 Triangle
a=1, b=2 → c=√5

How to use:

  • • Enter any two sides of a right triangle (a, b, or c)
  • • Side c is the hypotenuse (longest side, opposite the right angle)
  • • Sides a and b are the legs (shorter sides)
  • • Click "Calculate" to find the missing side
  • • View the step-by-step solution to understand the process
  • • Perfect for geometry, construction, and engineering calculations

❓Pythagorean Theorem FAQ

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