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Polygon Calculator
Calculate a regular polygon with 4 to 1,000 sides. Enter a side length, the center-to-side distance or the center-to-vertex distance to find area, perimeter and angles.
How do I calculate a regular polygon?
Choose the number of sides and enter one length: a side, the perpendicular distance from the center to a side, or the distance from the center to a vertex. Use one unit; area is returned in that unit squared.
Frequently asked questions
How do I calculate a regular polygon?
Choose the number of sides and enter one length: a side, the perpendicular distance from the center to a side, or the distance from the center to a vertex. Use one unit; area is returned in that unit squared.
Are my measurements uploaded?
No. The calculation runs in this browser and the measurements are not uploaded.
How do I find the area of a regular polygon?
Enter its number of sides and one known measurement. The calculator derives the apothem and perimeter, then uses area = perimeter × apothem ÷ 2.
Which lengths can I enter?
Enter a side length, the perpendicular distance from the center to a side, or the distance from the center to a vertex. The side count determines the remaining dimensions.