Openings
The quick room mode subtracts about 21 sq ft per door and 15 sq ft per window.
Free contractor tool
Paint Calculator
Estimate finish paint and optional primer without guessing from room square footage alone.
Walls + ceilingDoors & windowsCoverage + cost
Room paint takeoff
Estimate finish paint from room dimensions, openings, coats and the coverage printed on your paint.
The default 375 sq ft/gal is a planning midpoint. Rough or porous surfaces can use more paint, so use the coverage listed on the actual product.
Coverage varies
Most interior products land around 350–400 sq ft per gallon per coat on smooth prepared surfaces. Product labels control.
Primer is separate
The optional primer estimate uses one coat at a planning coverage of 300 sq ft per gallon.