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How Much Paint for a 20×20 Room?
3.4gallons
for two coats on the walls (8 ft ceilings) — buy 4 gallons
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| What | Amount |
|---|---|
| Wall area (8 ft ceilings, minus a door and window) | ≈ 600 sq ft |
| One coat, walls | 1.7 gallons |
| Two coats, walls (typical) | 3.4 gallons — buy 4 |
| Ceiling, one coat | 1.1 gallons |
The math: perimeter (80 ft) × 8 ft ceiling height − about 40 sq ft for a door and a window ≈ 600 sq ft of wall, at 350 sq ft per gallon per coat.
Taller ceilings, extra windows, or textured walls change the answer — use the calculator below for your exact room. Semi-gloss on trim is a separate (much smaller) quantity: a quart handles most rooms' trim.
Other room sizes
10×10 room10×12 room11×12 room12×12 room12×14 room12×16 room14×16 room15×15 room16×16 room16×20 room12×24 room
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