How Much Paint for a 10x12 Room? (Walls & Ceiling)

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Your results

Wall paint to buy2 gallons

Paintable wall area301 sq ft

Exact wall paint (2 coats)1.72 gal

Primer, if needed (1 coat)1 gallon

How much paint do you need for a 10×12 room — diagram

Wall paint for a 10×12 room by ceiling height

Two coats, 350 sq ft per gallon, one door and two windows subtracted.

Ceiling height	Wall area	Exact paint	Buy
8 ft	301 sq ft	1.72 gal	2 gallons
9 ft	345 sq ft	1.97 gal	2 gallons
10 ft	389 sq ft	2.22 gal	2 gallons + 1 quart

Ceiling paint

The ceiling is 120 sq ft. One coat needs 2 quarts; two coats need 1 gallon. Flat ceiling paint hides imperfections best.

Buying for this room

Walls and ceiling together come to about 2.4 gallons, so single gallons and quarts are the right size. If you plan to paint other rooms the same color, a 5-gallon bucket may still be the better buy. Need primer for new drywall or a big color change? Plan on 1 gallon for the walls.

The math

2 × (10 + 12) × 8 ft = 352 sq ft − 1 door (21) − 2 windows (30) = 301 sq ft 301 × 2 coats ÷ 350 = 1.72 gallons

Common questions

How many gallons of paint for a 10x12 room?

2 gallons for two coats on the walls with 8 ft ceilings, plus 1 gallon if you paint the ceiling.

How much paint for a 10x12 room with 9 ft ceilings?

2 gallons for two coats on the walls.

Is one gallon enough for a 10x12 room?

One gallon covers one coat on the walls (0.86 gal needed), but you'll want 2 gallons for two coats.

Want the full method, tips and other sizes? See the paint calculator guide.

Last reviewed November 1, 2026. Results are estimates — confirm with your supplier.

How much paint do you need for a 10×12 room?