12×12 room: paint by wall height
| Wall height | Paintable sq ft | Gallons (2 coats) | Buy |
|---|---|---|---|
| 8 ft | 334 | 1.91 | 2 |
| 9 ft | 382 | 2.18 | 3 |
| 10 ft | 430 | 2.46 | 3 |
1 door and 2 windows deducted; 350 sq ft per gallon.
Worked example
Perimeter: 2 × (12 + 12) = 48 ft. With 8 ft walls: 384 sq ft, minus 20 (door) and 30 (two windows) = 334 sq ft. Two coats: 668 ÷ 350 = 1.91 gallons. The ceiling adds 144 sq ft per coat (about 0.82 gallons for two coats).
Frequently asked questions
How many gallons to paint a 12×12 room?
About 1.91 gallons for two coats on 8 ft walls (buy 2).