basic

Pythagorean Theorem: Hypotenuse or Missing Leg Calculator

c = √(a²+b²); a = √(c²−b²) — right triangle sides.

Solves for the missing side of a right triangle: hypotenuse c = √(a²+b²), or leg a = √(c²−b²). Also computes the triangle's perimeter and area.

Priya Venkatesan By Priya Venkatesan
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

c² = a² + b²

In depth

Solves for the missing side of a right triangle: hypotenuse c = √(a²+b²), or leg a = √(c²−b²). Also computes the triangle's perimeter and area.