Paint for a 18×24 room
3.5 gallons (buy 4 gal)
for two coats on 621 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.
Paint for a 18×24 room by ceiling height
| Ceiling height | Wall area | 1 coat | 2 coats |
|---|---|---|---|
| 8 ft | 621 sq ft | 1.8 gal | 3.5 gal |
| 9 ft | 705 sq ft | 2 gal | 4 gal |
| 10 ft | 789 sq ft | 2.3 gal | 4.5 gal |
| 12 ft | 957 sq ft | 2.7 gal | 5.5 gal |
Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 432 sq ft, 1.23 gal per coat.
How it’s worked out
- Perimeter: 2 × (24 + 18) = 84 ft.
- Wall area: 84 × 8 ft = 672 sq ft, minus 21 for the door and 30 for the windows = 621 sq ft.
- Two coats: 621 × 2 ÷ 350 = 3.55 gallons.
Change the numbers
Other room sizes
- 16×24 room
- 20×24 room
- 15×24 room
- 18×20 room
- 14×24 room
- 18×18 room
- 13×24 room
- 12×24 room
- 16×18 room
- 24×24 room
- 15×18 room
- 11×24 room
Questions
- How much paint do I need for a 18×24 room?
- About 3.5 gallons for two coats on the walls of a 18×24 room with 8 ft ceilings, one door and two windows: buy 4 gal. The ceiling takes another 1.2 gallons per coat.
- How many square feet of wall is a 18×24 room?
- 672 sq ft of wall with 8 ft ceilings, or about 621 sq ft after one door and two windows.
- How much does it cost to paint a 18×24 room?
- Paint for the walls costs about $160 at $40 a gallon. Professional painters typically charge $2 to $6 per square foot of floor area, about $864 to $2,592 here.