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Area of a Triangle Calculator

Math
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Calculates the area of a triangle using different methods: base and height, or side lengths (using Heron's formula).

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Base of the triangle, Height of the triangle (for base/height calculation), Side A (for Heron's formula), Side B (for Heron's formula), Side C (for Heron's formula), and Calculation Method in the units shown.

Step 2

Read Semi-perimeter (s), Area (Base and Height), Area (Heron's Formula), and Area of the Triangle in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Base and Height - Example 1

Base of the triangle: 10 units; Height of the triangle (for base/height calculation): 5 units; Side A (for Heron's formula): 5 units; Side B (for Heron's formula): 6 units; Side C (for Heron's formula): 7 units; Calculation Method: Base and Height

Semi-perimeter (s): 9; Area (Base and Height): 25 square units; Area (Heron's Formula): 14.69693846 square units; Area of the Triangle: 25 square units

Base and Height - Example 2

Base of the triangle: 20 units; Height of the triangle (for base/height calculation): 10 units; Side A (for Heron's formula): 5 units; Side B (for Heron's formula): 6 units; Side C (for Heron's formula): 7 units; Calculation Method: Base and Height

Semi-perimeter (s): 9; Area (Base and Height): 100 square units; Area (Heron's Formula): 14.69693846 square units; Area of the Triangle: 100 square units

Heron's Formula - Example 1

Base of the triangle: 10 units; Height of the triangle (for base/height calculation): 5 units; Side A (for Heron's formula): 5 units; Side B (for Heron's formula): 6 units; Side C (for Heron's formula): 7 units; Calculation Method: Sides (Heron's Formula)

Semi-perimeter (s): 9; Area (Base and Height): 25 square units; Area (Heron's Formula): 14.69693846 square units; Area of the Triangle: 14.69693846 square units

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