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Regular Polygon Area Calculator

Area of any regular n-sided polygon.

Compute the area, perimeter, and apothem of a regular polygon from the number of sides and the side length.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Apothem a = s / (2 tan(π/n)); Area = ½ · n · s · a; Perimeter = n · s.

In depth

Compute the area, perimeter, and apothem of a regular polygon from the number of sides and the side length.