Regular Polygon Calculator

Formula

ns²/(4 tan(π/n))

Worked example

Square n=4, side=2 — 4

Quick answer

What does the Regular Polygon Calculator do?

Calculate regular polygon area from number of sides and side length.

What is the Regular Polygon Calculator?

Calculate regular polygon area from number of sides and side length. Use it when you have the required inputs and want a deterministic, repeatable result with the calculation method visible.

How to use this calculator

Enter the values requested by the tool, keep units and time periods consistent, resolve any validation message, calculate, then review the primary answer together with the displayed formula and supporting values.

Formula and method

This calculator uses the deterministic formula ns²/(4 tan(π/n)). Enter the required values, then review the displayed substitution and result breakdown to verify the calculation.

Worked example

Square n=4, side=2 4

Common mistakes to avoid

Check units, decimal points, percentages, signs, date/time order, selector choices, and rounding. For important decisions, verify the result against an independent source or qualified professional when appropriate.