Paint Coverage: Gallons for Common Room Sizes
Estimates assume 8-foot ceilings, 1 door (21 sq ft), 2 windows (30 sq ft), and 350 sq ft per gallon coverage on a primed surface. Walls only — does not include ceiling or trim.
Rough or unprimed surfaces absorb more — use 250–300 sq ft/gallon for texture. Round up to the nearest gallon when purchasing.
| Room size | 1 coat (gal) | 2 coats (gal) |
|---|---|---|
| 10×10 ft | 0.83 | 1.66 |
| 10×12 ft | 0.93 | 1.86 |
| 12×12 ft | 1.03 | 2.07 |
| 12×15 ft | 1.24 | 2.48 |
| 15×15 ft | 1.45 | 2.89 |
| 12×20 ft | 1.65 | 3.31 |
| 15×20 ft | 1.99 | 3.99 |
| 20×20 ft | 2.47 | 4.95 |