What is the Regular Polygon Calculator?
Calculate the area, perimeter and angles of any regular polygon. These geometry calculators work out area, perimeter, volume and surface area for common shapes. Units are flexible — enter every length in the same unit and the answer comes back in that unit (squared or cubed).
How to use the Regular Polygon Calculator
- Enter your number of sides, your side length.
- Results update automatically as you type; you can also press Calculate.
- Read the output: area, perimeter, interior angle, apothem.
- Use the 📊 chart to see the result visually, then copy or share it.
Formula and method
Worked example
With number of sides = 6, side length = 5, the Regular Polygon Calculator returns area: 64.9519052838; perimeter: 30; interior angle: 120.0000°.
Tips for better results
- Keep all measurements in one unit before calculating.
- Area units are squared (m², ft²) and volume units are cubed (m³, ft³).
- Use our area and volume converters to switch units afterwards.
Frequently asked questions
What does the Regular Polygon Calculator do?
Calculate the area, perimeter and angles of any regular polygon.
How is it calculated?
The Regular Polygon Calculator uses this method: A = n s² ÷ (4 tan(π/n)).
Can you show an example?
With number of sides = 6, side length = 5, the Regular Polygon Calculator returns area: 64.9519052838; perimeter: 30; interior angle: 120.0000°.
Is the Regular Polygon Calculator accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the Regular Polygon Calculator is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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