Paint for a 15x20 Room: How Many Gallons?
A 15 × 20 ft room with 8 ft ceilings has 560 sq ft of wall. Take off one door and two windows and two coats need 2.91 gallons of paint, so buy 3 gallons of paint. Adjust the wall height, coats or openings below for your room.
Buy 3 gallons of paint
- Paint needed
- 2.91 gallons
- Wall area
- 510 sq ft (after doors & windows)
- Total painted
- 1,020 sq ft over 2 coats
- Assumes 350 sq ft per gallon. Check your can: rough or porous surfaces can use 20–30% more.
- Ceilings usually take a different (flat) paint. Buy it separately.
Frequently asked questions
How many gallons of paint for a 15x20 room?
Buy 3 gallons of paint for two coats on 8 ft walls, not including the ceiling.
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