How much paint do you need? Enter the room and get gallons for the job — not a guess. Paint Calculator estimates finish paint and primer from the room, openings, and the coverage on the can. Buy amounts are rounded up to whole gallons. • Length, width, and height in feet and inches • Paint walls, ceiling, or both • Subtracts 21 sq ft per door and 15 sq ft per window • Optional moulding from perimeter × width • Finish and primer coats, with coverage you can match to the label • Square-foot breakdown so you can see the math • Typical finish coverage 350 sq ft/gal; primer 250 — check the can and adjust Estimating tool only. Coverage depends on the paint, surface texture, and color change. Two finish coats is the usual job; set primer coats to 0 if you are not priming.
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