Measure irregular lawn polygons from surveyed coordinates, combine separate areas and subtract exclusions.
Draw measured vertices on a 20 × 20 metre grid. Add each boundary, then calculate. Use Clear to remove the example first.
How this calculator works
Enter boundary coordinates in metres, in clockwise or counterclockwise order. Each row is x,y; blank lines separate polygons. Prefix an exclusion polygon with a minus sign on its own line. Use a common measured coordinate system. Polygon area uses the shoelace formula. Enter non-overlapping inclusion areas and subtract each exclusion once; exclusions must lie inside the lawn and must not overlap. This tool rejects self-crossing individual boundaries but does not calculate unions or validate containment between separate polygons. The diagram displays your measurements; it is not a satellite map. Use the copy button to reuse the net square-metre result in other calculators.
Units and inputs
Use measured inputs and replace the demonstration values. 1 ft = 0.3048 m; 1 sq ft = 0.09290304 m²; 1 inch = 25.4 mm; 1 US gallon = 3.785411784 litres. All entered prices must use the same currency. Zero prices omit the optional budget.
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