basic

Regular Polygon Interior Angle Calculator

Interior angle = (n − 2) · 180 / n.

Compute the interior angle of a regular n-gon and the sum of all interior angles: each = (n − 2) · 180 / n; sum = (n − 2) · 180.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

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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

Interior = (n − 2) · 180 / n; sum = (n − 2) · 180.

In depth

Compute the interior angle of a regular n-gon and the sum of all interior angles: each = (n − 2) · 180 / n; sum = (n − 2) · 180.