Paint for a 15×18 room
2.7 gallons (buy 3 gal)
for two coats on 477 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.
Paint for a 15×18 room by ceiling height
| Ceiling height | Wall area | 1 coat | 2 coats |
|---|---|---|---|
| 8 ft | 477 sq ft | 1.4 gal | 2.7 gal |
| 9 ft | 543 sq ft | 1.6 gal | 3.1 gal |
| 10 ft | 609 sq ft | 1.7 gal | 3.5 gal |
| 12 ft | 741 sq ft | 2.1 gal | 4.2 gal |
Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 270 sq ft, 0.77 gal per coat.
How it’s worked out
- Perimeter: 2 × (18 + 15) = 66 ft.
- Wall area: 66 × 8 ft = 528 sq ft, minus 21 for the door and 30 for the windows = 477 sq ft.
- Two coats: 477 × 2 ÷ 350 = 2.73 gallons.
Change the numbers
Other room sizes
- 14×18 room
- 16×18 room
- 15×16 room
- 15×20 room
- 13×18 room
- 15×15 room
- 12×18 room
- 18×18 room
- 14×15 room
- 11×18 room
- 13×15 room
- 10×18 room
Questions
- How much paint do I need for a 15×18 room?
- About 2.7 gallons for two coats on the walls of a 15×18 room with 8 ft ceilings, one door and two windows: buy 3 gal. The ceiling takes another 0.8 gallons per coat.
- How many square feet of wall is a 15×18 room?
- 528 sq ft of wall with 8 ft ceilings, or about 477 sq ft after one door and two windows.
- How much does it cost to paint a 15×18 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 $540 to $1,620 here.