Finish Calculators
Free paint calculator for gallons needed per room by wall area, coats, doors, and windows.
Calculate how many gallons of paint you need for any room. Enter wall dimensions, subtract doors and windows, choose number of coats and coverage per gallon, and get separate gallon counts for walls, ceilings, and trim.
Available tools
- Paint Coverage Calculator — gallons by wall area, number of coats, doors, windows, and ceiling