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11×12 room: paint by wall height
| Wall height | Paintable sq ft | Gallons (2 coats) | Buy |
|---|---|---|---|
| 8 ft | 318 | 1.82 | 2 |
| 9 ft | 364 | 2.08 | 3 |
| 10 ft | 410 | 2.34 | 3 |
1 door and 2 windows deducted; 350 sq ft per gallon.
Worked example
Perimeter: 2 × (11 + 12) = 46 ft. With 8 ft walls: 368 sq ft, minus 20 (door) and 30 (two windows) = 318 sq ft. Two coats: 636 ÷ 350 = 1.82 gallons. The ceiling adds 132 sq ft per coat (about 0.75 gallons for two coats).
Frequently asked questions
How many gallons to paint a 11×12 room?
About 1.82 gallons for two coats on 8 ft walls (buy 2).