Triangle Calculator
Easily find the area of any triangle using Base & Height, or use all three side lengths.
Triangle Area Calculator
Method 1: Base & Height
Area
Method 2: Three Sides (SSS)
Results (Heron's Formula)
Area
Perimeter
Semi-perimeter
Angles (A, B, C)
How to calculate the area of a triangle?
There are two common ways to calculate the area depending on what information you have:
- If you know the Base and Height: Multiply the base by the height, and divide by 2.
Area = (base × height) / 2 - If you know all 3 sides: Use Heron's formula. First, find the semi-perimeter (s) by adding all sides and dividing by 2. Then, calculate the area.
Area = √(s(s-a)(s-b)(s-c))