How Much Paint for a 12x12 Room?
1.9 gallons
Painting the walls of a 12 × 12 ft room with 8 ft ceilings, one door and two windows takes about 1.9 gallons for two coats (333 sq ft of wall at 350 sq ft per gallon). Buy 2 gallons. Add the ceiling in the calculator below if you are painting it too.
Paint for a 12 × 12 ft room by wall height (2 coats, 1 door, 2 windows)
| Wall height | Wall area | Paint needed | What to buy |
|---|---|---|---|
| 8 ft | 333 sq ft | 1.9 gallons | 2 gallons |
| 9 ft | 381 sq ft | 2.18 gallons | 2 gallons + 1 quart |
| 10 ft | 429 sq ft | 2.45 gallons | 3 gallons |
Adjust the numbers
The calculator below is pre-filled with the numbers above. Change any value to match your project.
Paint needed1.9 gallons
- What to buy
- 2 gallons
- Paintable area
- 333 sq ft
- Total coverage (all coats)
- 666 sq ft
How it is calculated
The wall area of a room is its perimeter, 2 × (length + width), multiplied by the wall height. A standard door (about 21 sq ft) and window (about 15 sq ft) are subtracted for each one you enter.
If you include the ceiling, its area (length × width) is added.
Open the full paint calculator for other shapes, a worked example and FAQs.