Walls only, two coats, 350 sq ft per gallon
| Room (ft) | Wall sq ft (8 ft) | Gallons | Buy this | Wall sq ft (9 ft) | Gallons | Buy this |
|---|---|---|---|---|---|---|
| 10 × 10 | 320 | 1.83 | 2 gallons | 360 | 2.06 | 2 gallons + 1 quart |
| 12 × 12 | 384 | 2.19 | 2 gallons + 1 quart | 432 | 2.47 | 2 gallons + 2 quarts |
| 12 × 14 | 416 | 2.38 | 2 gallons + 2 quarts | 468 | 2.67 | 3 gallons |
| 14 × 16 | 480 | 2.74 | 3 gallons | 540 | 3.09 | 3 gallons + 1 quart |
| 16 × 20 | 576 | 3.29 | 3 gallons + 2 quarts | 648 | 3.70 | 4 gallons |
| 20 × 20 | 640 | 3.66 | 4 gallons | 720 | 4.11 | 1 five-gallon bucket |
Wall area is gross: the whole perimeter times the wall height. Subtract 20 sq ft per door and 15 per window (or use the paint calculator) for a tighter number. “Buy this” is the cheapest mix of 5-gallon buckets, gallons and quarts at typical 2026 prices ($45 gallon, $20 quart, $200 bucket).
Using the chart
- Add the ceiling separately: length × width, two coats.
- For one coat, halve the gallons. For three coats, multiply by 1.5.
- Rough walls: use 250 sq ft per gallon instead of 350.
Estimates only. Check your paint can’s label for coverage. Prices are typical 2026 US figures; use your store’s.