Pythagorean Theorem Calculator

Use the form below to calculate the value for the hypotenuse of a right triangle.

Image showing a right triangle


  1. Enter the values for the 2 short sides of the triangle (a & b).
  2. The 3rd side (c, the hypotenuse) will be calculated automatically.


The Pythagorean Theorem states that the square of the length of the hypotenuse (the longest of the 3 sides, the one that does not touch the 90˚ angle) of a right triangle (any triangle that has one angle that is equal to 90˚) equals the sum of the squares of the other 2 sides (the short sides, the ones that do touch the 90˚ angle).

In other words: a2 + b2 = c2

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