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Equilateral Triangle Area Calculator

Triangle area: -
Visual representation

Equilateral Triangle Area Calculator diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

All three sides are assumed equal and all three angles are 60°. The result uses square units.
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How the Equilateral Triangle Area Calculator works

Calculate the area of an equilateral triangle from its side length.

Formula

√(3) × side × side ÷ 4

How to use this calculator

  1. Enter every measurement using one consistent length or angle unit.
  2. Select Calculate to evaluate the formula.
  3. Review the substituted values in the calculation explanation.

Interpretation and limitations

All three sides are assumed equal and all three angles are 60°. The result uses square units. Decimal answers are rounded for display; retain additional precision for subsequent calculations.

Geometry collection

This calculator belongs to the Plane Geometry section of the Math calculator library.

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About this calculator

Calculate the area of an equilateral triangle from its side length.