Triangle Calculator

Calculate missing sides, angles, area, and perimeter with common triangle-solving inputs.

SSS mode: enter all three side lengths to solve area, perimeter, and angles.

Side a

Side b

Side c

Area = 6Heron's formula

12Perimeter

36.869898°Angle A

53.130102°Angle B

90°Angle C

How to use this Triangle Calculator

Solve common triangles from SSS, SAS, or two angles plus one side. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.