Triangle Calculator

Calculate area, perimeter, and angles of a triangle.

Option 1: Base & Height

Base (b)

Height (h)

Option 2: 3 Sides (SSS)

Side A

Side B

Side C

How to use Triangle Calculator

Inputs: Enter what you know (e.g., 3 sides, or 2 sides + 1 angle).
Calculate: The tool solves the entire triangle.

About Triangle Calculator

The Triangle Calculator solves for unknown sides, angles, area, and perimeter. It handles Right Triangles (Pythagoras) and Oblique Triangles (Law of Sines/Cosines).

Uses Heron's Formula to find area when only 3 sides are known.