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15×15 room: paint by wall height
| Wall height | Paintable sq ft | Gallons (2 coats) | Buy |
|---|---|---|---|
| 8 ft | 430 | 2.46 | 3 |
| 9 ft | 490 | 2.80 | 3 |
| 10 ft | 550 | 3.14 | 4 |
1 door and 2 windows deducted; 350 sq ft per gallon.
Worked example
Perimeter: 2 × (15 + 15) = 60 ft. With 8 ft walls: 480 sq ft, minus 20 (door) and 30 (two windows) = 430 sq ft. Two coats: 860 ÷ 350 = 2.46 gallons. The ceiling adds 225 sq ft per coat (about 1.29 gallons for two coats).
Frequently asked questions
How many gallons to paint a 15×15 room?
About 2.46 gallons for two coats on 8 ft walls (buy 3).