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Pythagorean Theorem Calculator

Pythagorean Theorem Calculator

Calculate the hypotenuse or leg of a right triangle using the Pythagorean theorem with step-by-step solutions.

The Pythagorean theorem calculator helps you find the missing side of a right triangle. Simply enter two known sides and instantly calculate the third side using the famous formula a² + b² = c².

  1. Enter the length of leg a (one of the shorter sides)
  2. Enter the length of leg b (the other shorter side)
  3. The calculator instantly shows the hypotenuse (c)
  4. View the step-by-step solution to understand the calculation
  • Calculate hypotenuse from two legs
  • Step-by-step solution display
  • Visual triangle preview
  • Support for multiple units (cm, m, in, ft)
  • Real-time calculation as you type
What is the Pythagorean theorem?
The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (c) equals the sum of squares of the other two sides (a and b): a² + b² = c².
Which side is the hypotenuse?
The hypotenuse is the longest side of a right triangle, located opposite the 90-degree angle.
Can I find a leg if I know the hypotenuse?
Yes, use the general Triangle Calculator tab to solve for any missing side when you know two sides.
Enter Values
Enter any two sides to calculate the third side
The hypotenuse (c) is always the longest side
Works with any unit of measurement
Want to learn more? Read documentation →
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