Example: Number of sides: 6 · Side length: 4 → Area: 41.5692.
Perimeter: 24
Interior angle: 120°
Apothem: 3.4641
Frequently asked questions
How do I calculate regular polygon? Enter your numbers above and the result updates instantly. For example: Number of sides: 6 · Side length: 4 → Area: 41.5692.
Is this Regular Polygon Calculator free? Yes — completely free with no sign-up or paywall. It runs entirely in your browser and keeps working offline; the numbers you enter never leave your device.
How accurate is it? It uses the standard published formula for regular polygon. Results are estimates for planning — not financial, tax, medical, engineering, or legal advice.