Paint Coverage Calculator

Stop overbuying paint. Enter room dimensions, doors, windows, and coats to see exactly how many gallons (and quarts for touch-up) you need. Adjust coverage to match your specific paint, and estimate cost with your gallon price.

Paint Calculator

Room length (ft)

Room width (ft)

Ceiling height (ft)

Number of doors

Number of windows

Number of coats

Coverage per gallon (sq ft)

Price per gallon ($)

Include ceiling?

Add ceiling area

Paint Needed

Total wall area—

Paintable area (after doors/windows)—

Total area to paint (× coats)—

Gallons needed—

Quarts needed (round up)—

Estimated cost—

Standard subtractions: 20 sq ft per door, 15 sq ft per window. Most premium interior paints cover 350–400 sq ft per gallon on smooth, primed surfaces.