Polygon Angles Calculator
Find the interior angle sum and per-angle values of a regular polygon.
Quick answer: enter your details below and click Calculate Angles — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter the number of sides (3 or more).
- Click Calculate Angles.
- Read the sum and per-angle values.
About this tool
Enter the number of sides, at least 3. The tool uses the standard rule that interior angles sum to (n - 2) x 180 degrees, then divides for a regular polygon and shows the exterior angle too. It describes regular polygons only; irregular ones share the sum but not the per-angle value.
Frequently asked questions
Does it work for irregular polygons?
The sum is the same, but only regular polygons have equal interior angles.
Why do exterior angles sum to 360?
Walking around any polygon turns you through one full turn, whatever its shape.