Triangle Calculator

Give it three known values from any triangle and it figures out everything else - all sides, all angles, area, and perimeter. Uses the Law of Sines and Cosines under the hood so it works for any triangle, not just right-angled ones.

How to use

  1. Choose what you already know: three sides (SSS), two sides and an angle (SAS), or two angles and a side (ASA).
  2. Enter those values into the fields that appear.
  3. Everything else - missing sides, angles, area, perimeter - fills in automatically.

Related tools:

Scientific CalculatorPermutation & CombinationProbability Calculator