Free area calculator

Regular Polygon Area Calculator

Regular Polygon Area Calculator: Calculate a regular polygon area from side count and side length, or convert a known polygon area from a deed

Regular Polygon

Material Waste FactorOPTIONAL

Estimate Material CostOPTIONAL

Calculation Results

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1 ft (12 in) 1 ft 1 ft² = 144 in²

Regular Polygon Area Calculator

Select the Regular Polygon shape, enter the number of sides (3 or more) and the length of one side, then click Calculate. The calculator applies the formula Area = (n × s²) / (4 × tan(π/n)) to find the area of any regular polygon, including triangles, pentagons, hexagons, and octagons, in square feet, square yards, square meters, and acres.

If you already know the polygon area from a deed or survey, switch to the Known Area shape to convert it between area units instead. For an irregular polygon with unequal sides, break it into rectangles and triangles, calculate each section, and add the results.

How It Works

1

Select Shape

Choose the shape that matches your space.

2

Enter Dimensions

Enter measurements in any unit. Add quantity, waste factor, and material price if you need them.

3

Get Results

See area in ft², in², yd², m², and acres, plus a cost estimate when you enter a price.

Frequently Asked Questions

Select Regular Polygon, enter the number of sides (3 or more) and one side length, then click Calculate. The tool uses Area = (n × s²) / (4 × tan(π/n)) for pentagons, hexagons, octagons, and other regular shapes.
Yes. Enter 5 for a pentagon or 6 for a hexagon in Number of Sides, add the side length, and click Calculate. The same tool handles any equal-sided polygon with 3 sides or more.
Use Known Area if you already have the total, or break the shape into rectangles and triangles, calculate each section here, and add the results.
If a deed or survey gives total area in acres or square meters, use Known Area to convert to square feet. Otherwise, divide the lot into shapes you can measure, calculate each, and add.
Indoors, a tape measure or laser distance meter works. Outdoors, try a measuring wheel, GPS surveying app, or satellite image with a scale. For legal accuracy, hire a surveyor.
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