Paint for a 9×20 room
2.4 gallons (buy 2 gal + 2 qt)
for two coats on 413 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.
Paint for a 9×20 room by ceiling height
| Ceiling height | Wall area | 1 coat | 2 coats |
|---|---|---|---|
| 8 ft | 413 sq ft | 1.2 gal | 2.4 gal |
| 9 ft | 471 sq ft | 1.3 gal | 2.7 gal |
| 10 ft | 529 sq ft | 1.5 gal | 3 gal |
| 12 ft | 645 sq ft | 1.8 gal | 3.7 gal |
Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 180 sq ft, 0.51 gal per coat.
How it’s worked out
- Perimeter: 2 × (20 + 9) = 58 ft.
- Wall area: 58 × 8 ft = 464 sq ft, minus 21 for the door and 30 for the windows = 413 sq ft.
- Two coats: 413 × 2 ÷ 350 = 2.36 gallons.
Change the numbers
Other room sizes
- 9×18 room
- 8×20 room
- 10×20 room
- 9×16 room
- 9×24 room
- 11×20 room
- 9×15 room
- 9×14 room
- 12×20 room
- 9×13 room
- 9×12 room
- 13×20 room
Questions
- How much paint do I need for a 9×20 room?
- About 2.4 gallons for two coats on the walls of a 9×20 room with 8 ft ceilings, one door and two windows: buy 2 gal + 2 qt. The ceiling takes another 0.5 gallons per coat.
- How many square feet of wall is a 9×20 room?
- 464 sq ft of wall with 8 ft ceilings, or about 413 sq ft after one door and two windows.
- How much does it cost to paint a 9×20 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 $360 to $1,080 here.