Regular polygon area calculator
Area of a regular n-gon from number of sides and side length (or apothem).
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Tool guide
Regular polygon area calculator: how it works
Practical information to understand the result and use this tool correctly.
About Regular polygon area calculator
Regular polygons have equal sides and angles; the area formula uses n and side length s.
You also get perimeter and apothem for secondary checks.
Works for triangles through high-n shapes approaching a circle.
How to use it
- 1Enter integer n ≥ 3 and side length s.
- 2Calculate area, perimeter, and apothem.
- 3Keep s in your preferred length unit.
Frequently asked questions
- What is the apothem?
- Distance from center perpendicular to a side.
- n = 4?
- That is a square: area becomes s².