Paint Calculator

Enter the room, match the can, and get finish and primer rounded up to whole gallons.

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.