Paint for a 20x20 Room: How Many Gallons?
A 20 × 20 ft room with 8 ft ceilings has 640 sq ft of wall. Take off one door and two windows and two coats need 3.37 gallons of paint, so buy 3 gallons + 2 quarts of paint. Adjust the wall height, coats or openings below for your room.
Buy 3 gallons + 2 quarts of paint
- Paint needed
- 3.37 gallons
- Wall area
- 590 sq ft (after doors & windows)
- Total painted
- 1,180 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 20x20 room?
Buy 3 gallons + 2 quarts of paint for two coats on 8 ft walls, not including the ceiling.
Developers: GET /api/paint-calculator returns JSON.