9×10 room: paint by wall height
| Wall height | Paintable sq ft | Gallons (2 coats) | Buy |
|---|---|---|---|
| 8 ft | 254 | 1.45 | 2 |
| 9 ft | 292 | 1.67 | 2 |
| 10 ft | 330 | 1.89 | 2 |
1 door and 2 windows deducted; 350 sq ft per gallon.
Worked example
Perimeter: 2 × (9 + 10) = 38 ft. With 8 ft walls: 304 sq ft, minus 20 (door) and 30 (two windows) = 254 sq ft. Two coats: 508 ÷ 350 = 1.45 gallons. The ceiling adds 90 sq ft per coat (about 0.51 gallons for two coats).
Frequently asked questions
How many gallons to paint a 9×10 room?
About 1.45 gallons for two coats on 8 ft walls (buy 2).