Paint Calculator
One gallon covers about 350–400 square feet per coat. Enter the room size to see how many gallons to buy for two coats.
Frequently asked questions
How much paint for a 12 × 14 room?
With 8-foot walls, one door and two windows, about 365 square feet of wall: just over 2 gallons for two coats, so buy 3 gallons or a 2-gallon kit plus a quart.
Do I need primer?
Use primer over new drywall, stains, or a big color change. Paint-and-primer products can work for similar colors.