What does this calculate?

For a right triangle, given the two legs it finds the hypotenuse via a² + b² = c², the area as ½ × base × height, and the perimeter as the sum of all three sides.

Does it work for non-right triangles?

No. This tool assumes a right triangle. For a general triangle you would need angles or the law of cosines.

How is the area derived?

For a right triangle the two legs are the base and height, so the area is simply half their product.

Is my input sent to a server?

No. The Pythagorean and area calculations run in your browser; the side lengths are never transmitted.

Math & Science

Triangle Calculator

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Calculate the hypotenuse, area, and perimeter of a right triangle using the Pythagorean theorem. Free, instant results in your browser — no account required.

Como usar esta ferramenta

Enter the two legs of the right triangle.
The hypotenuse, area, and perimeter are computed instantly.
Read all three results derived from the Pythagorean theorem.

Leg a

Leg b

Right Triangle Results

Hypotenuse (c)

Area

Perimeter

Formula: c = √(a² + b²) = √(3² + 4²) = 5

Perguntas frequentes

What does this calculate?: For a right triangle, given the two legs it finds the hypotenuse via a² + b² = c², the area as ½ × base × height, and the perimeter as the sum of all three sides.
Does it work for non-right triangles?: No. This tool assumes a right triangle. For a general triangle you would need angles or the law of cosines.
How is the area derived?: For a right triangle the two legs are the base and height, so the area is simply half their product.
Is my input sent to a server?: No. The Pythagorean and area calculations run in your browser; the side lengths are never transmitted.

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