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Right Triangle Calculator

Hypotenuse, angles, area, and perimeter from two legs.

From the two legs (a, b) of a right triangle, compute the hypotenuse, both acute angles, the area, and the perimeter.

Daniel Oh By Daniel Oh
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

c = √(a² + b²). α = atan(a/b). β = 90° − α. Area = ½ab. Perimeter = a + b + c.

In depth

From the two legs (a, b) of a right triangle, compute the hypotenuse, both acute angles, the area, and the perimeter.