Triangle Calculator

Enter three side lengths and get the area (Heron's formula), all three angles, perimeter and the triangle's type. Runs in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is Triangle Calculator free to use?

Yes — Triangle Calculator is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. Triangle Calculator works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use Triangle Calculator?

Open the tool, add your file (or paste your content), adjust any options, then press “Solve triangle”. Your result is ready to download in seconds.

Find the missing side of a right triangle.

Radius, diameter, circumference, area.

log₁₀, ln, log₂ or any base.

Solve A:B = C:X proportions.

Type Bangla in English letters — Avro-style phonetic.

Count how often each word appears.