Paint Calculator

Most paints cover 300–400 ft² per gallon for one coat on a smooth, primed surface. Textured walls, unprimed drywall, or darker color changes may reduce coverage significantly.

For a precise estimate, yes — subtract about 20 ft² per standard door and 15 ft² per standard window. This calculator's waste buffer helps absorb small omissions, but large openings should be subtracted manually.

Two coats are standard for even coverage and true color, especially over a different existing color. A single coat may work with high-hiding paint over a similar base color, and dramatic color changes may need a primer coat plus two topcoats.

Gallons are more cost-effective for most rooms. Quarts make sense for small accent walls, touch-ups, or testing a color before committing to a full gallon.

Yes — ceilings use a different area (length × width of the room) and often a different paint formulated for ceilings, so calculate that coverage separately from wall paint.