Triangle calculator

How it works

1. Enter the values for your problem.
2. Choose Calculate to see the result and calculation details.
3. Change an input and calculate again to compare scenarios.

Example & practical use

A 3–4–5 triangle has area 6 and perimeter 12.

What to know

All side lengths must use the same unit and satisfy the triangle inequality.

Are my files or inputs uploaded?

Image and text processing happens in your browser. Your files are not uploaded to our servers.

Found an issue?

We are improving this alpha release. Tell us the tool, your device and the expected result through the contact page. You do not need to share private inputs or original files. Contact