Paint for a 12×18 room
2.5 gallons (buy 2 gal + 2 qt)
for two coats on 429 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.
Paint for a 12×18 room by ceiling height
| Ceiling height | Wall area | 1 coat | 2 coats |
|---|---|---|---|
| 8 ft | 429 sq ft | 1.2 gal | 2.5 gal |
| 9 ft | 489 sq ft | 1.4 gal | 2.8 gal |
| 10 ft | 549 sq ft | 1.6 gal | 3.1 gal |
| 12 ft | 669 sq ft | 1.9 gal | 3.8 gal |
Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 216 sq ft, 0.62 gal per coat.
How it’s worked out
- Perimeter: 2 × (18 + 12) = 60 ft.
- Wall area: 60 × 8 ft = 480 sq ft, minus 21 for the door and 30 for the windows = 429 sq ft.
- Two coats: 429 × 2 ÷ 350 = 2.45 gallons.
Change the numbers
Other room sizes
- 11×18 room
- 13×18 room
- 12×16 room
- 12×20 room
- 10×18 room
- 12×15 room
- 14×18 room
- 12×14 room
- 9×18 room
- 15×18 room
- 12×13 room
- 8×18 room
Questions
- How much paint do I need for a 12×18 room?
- About 2.5 gallons for two coats on the walls of a 12×18 room with 8 ft ceilings, one door and two windows: buy 2 gal + 2 qt. The ceiling takes another 0.6 gallons per coat.
- How many square feet of wall is a 12×18 room?
- 480 sq ft of wall with 8 ft ceilings, or about 429 sq ft after one door and two windows.
- How much does it cost to paint a 12×18 room?
- Paint for the walls costs about $120 at $40 a gallon. Professional painters typically charge $2 to $6 per square foot of floor area, about $432 to $1,296 here.