This page is tuned for clean geometry checks during drafting or homework around regular polygon interior angle.
Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.
Enter job values, review the estimate, then use the decision hints before ordering or quoting.
interior angle = ((n - 2) x 180) / nA regular polygon shares its full interior-angle sum equally across every corner.
The minimum valid side count is 3.
This polygon interior angle calculator helps when number of sides are already known and you want the interior angle quickly.
Next: polygon exterior angle.
Next: regular polygon central angle.
Keep more decimals whenever this result will be reused in another formula, drawing step, or comparison instead of being rounded once at the end.