Paint for a 15×20 room
2.9 gallons (buy 3 gal)
for two coats on 509 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.
Paint for a 15×20 room by ceiling height
| Ceiling height | Wall area | 1 coat | 2 coats |
|---|---|---|---|
| 8 ft | 509 sq ft | 1.5 gal | 2.9 gal |
| 9 ft | 579 sq ft | 1.7 gal | 3.3 gal |
| 10 ft | 649 sq ft | 1.9 gal | 3.7 gal |
| 12 ft | 789 sq ft | 2.3 gal | 4.5 gal |
Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 300 sq ft, 0.86 gal per coat.
How it’s worked out
- Perimeter: 2 × (20 + 15) = 70 ft.
- Wall area: 70 × 8 ft = 560 sq ft, minus 21 for the door and 30 for the windows = 509 sq ft.
- Two coats: 509 × 2 ÷ 350 = 2.91 gallons.
Change the numbers
Other room sizes
- 14×20 room
- 16×20 room
- 15×18 room
- 13×20 room
- 12×20 room
- 15×16 room
- 15×24 room
- 18×20 room
- 15×15 room
- 11×20 room
- 14×15 room
- 10×20 room
Questions
- How much paint do I need for a 15×20 room?
- About 2.9 gallons for two coats on the walls of a 15×20 room with 8 ft ceilings, one door and two windows: buy 3 gal. The ceiling takes another 0.9 gallons per coat.
- How many square feet of wall is a 15×20 room?
- 560 sq ft of wall with 8 ft ceilings, or about 509 sq ft after one door and two windows.
- How much does it cost to paint a 15×20 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 $600 to $1,800 here.