Free paint calculator
Paint Calculator
Estimate gallons from measured area, coat count and the coverage stated for the product you plan to use.
How the estimate works
The calculator subtracts entered openings, multiplies the remaining area by the number of coats, and divides that coated area by the product coverage you enter. Exact gallons and a rounded whole-gallon purchase estimate are shown separately.
Keep product coverage visible
Coverage can vary by coating and surface condition, so ProjectCalcWorks does not hide a universal square-foot-per-gallon assumption. Use the specification for the exact product and verify the result against the package size available to you.