Paint for a 10×12 room

1.7 gallons (buy 2 gal)

for two coats on 301 sq ft of wall: 8 ft ceilings, one door, two windows, 350 sq ft per gallon.

Paint for a 10×12 room by ceiling height

Ceiling heightWall area1 coat2 coats
8 ft301 sq ft0.9 gal1.7 gal
9 ft345 sq ft1 gal2 gal
10 ft389 sq ft1.1 gal2.2 gal
12 ft477 sq ft1.4 gal2.7 gal

Wall area subtracts one door (21 sq ft) and two windows (15 sq ft each). Ceiling: 120 sq ft, 0.34 gal per coat.

How it’s worked out

  1. Perimeter: 2 × (12 + 10) = 44 ft.
  2. Wall area: 44 × 8 ft = 352 sq ft, minus 21 for the door and 30 for the windows = 301 sq ft.
  3. Two coats: 301 × 2 ÷ 350 = 1.72 gallons.

Change the numbers

Wall paint needed

1.7 gallons

Buy 2 gallons for 301 sq ft of wall, 2 coats.

Wall area (less doors and windows)301 sq ft
Wall paint1.72 gal: buy 2 gallons
Ceiling paint, 1 coat0.34 gal: buy 2 quarts
Primer, 1 coat0.86 gal

Other room sizes

Questions

How much paint do I need for a 10×12 room?
About 1.7 gallons for two coats on the walls of a 10×12 room with 8 ft ceilings, one door and two windows: buy 2 gal. The ceiling takes another 0.3 gallons per coat.
How many square feet of wall is a 10×12 room?
352 sq ft of wall with 8 ft ceilings, or about 301 sq ft after one door and two windows.
How much does it cost to paint a 10×12 room?
Paint for the walls costs about $80 at $40 a gallon. Professional painters typically charge $2 to $6 per square foot of floor area, about $240 to $720 here.

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