chuck How it adds up
Gross area = sum of each surface’s length × width. Excluded area = sum of each excluded rectangle’s length × width. Net area = gross area − excluded area.
Keep the measured rectangles separate
The calculator adds the areas you enter; it cannot detect rectangles that overlap. Split an irregular surface into non-overlapping rectangles, and exclude only areas within those measured surfaces. A zero net area is allowed when the exclusions exactly equal the gross area.
This measures area, not a sheet layout, cutting plan or installation specification. Use the product’s effective coverage and any required coats or layers in the next calculation.
Use your net measurement
Continue to the area coverage and pack calculator or paint and coating quantity calculator. The entries on this page stay in your browser and are not saved by this tool.