Triangle Calculator

Calculate triangle perimeter, area, and angles from side lengths.

How to use Triangle Calculator

  1. Enter the values requested by the calculator.
  2. Review the result, formula and detailed breakdown.
  3. Adjust inputs or copy, print and share the result.

Processing and privacy

The supported processing runs locally in your browser.

This tool has a real browser-side processing path and passed representative verification.

Common questions

Is Triangle Calculator available now?

Available now and verified for normal production use.

Where does processing happen?

The supported processing runs locally in your browser.

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  • Right Triangle Calculator — Calculate right triangle sides and angles with Pythagorean theorem.