Polygon Area Calculator

Calculate the area of regular and irregular polygons.

Number of Sides (n)

Side Length

#XY

Enter your values above to see the result.

Your Results

Area

Perimeter

Polygon Diagram

Formulas

Regular: A = (n·s²)/(4·tan(π/n))
Shoelace (irregular):
A = ½|Σ(xᵢ·yᵢ₊₁ − xᵢ₊₁·yᵢ)|

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Pro Tips

Results update as you type — change any field to see the effect immediately.

Check that every value uses the same unit before comparing results.

Use the copy button to paste the polygon area figures into a note or spreadsheet.

Nothing is sent to a server, so you can use this with private figures.