Math

Pythagorean theorem calculator

Find the missing side of a right triangle, its area and angles.

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How it works

a² + b² = c². Leave the side you want empty: the hypotenuse c, or one of the sides a or b.

Results are for guidance only and do not replace professional advice.

Worked example

With the default values:

Side a3
Side b4

you get:

Side c5
Area6
Perimeter12
Angles36.87° · 53.13° · 90°

Frequently asked questions

How does the “Pythagorean theorem calculator” tool work?

a² + b² = c². Leave the side you want empty: the hypotenuse c, or one of the sides a or b.

What do I need to enter?

Just fill in: side a, side b, hypotenuse c. The result updates as you type.

Can you give an example?

Side a: 3; Side b: 4 → Side c: 5; Area: 6.

Is this calculator free, and is my data private?

Yes. HOD Calc is completely free with no sign-up. The calculation runs in your browser: nothing you type is sent or stored.