How Much Paint Do I Need for a 12x12 Room?
A typical 12 ft by 12 ft room with 8 ft walls needs about 2 gallons for two coats after subtracting one door and two average windows. Buy 3 gallons when the color change is strong, the wall texture is heavy, or you want extra paint for touch-ups.
Quick estimate
- Wall area: 2 x (12 + 12) x 8 = 384 sq ft
- Subtract one door and two windows: about 51 sq ft
- Paintable wall area: about 333 sq ft
- Two coats: about 666 sq ft of coverage
- At 350 sq ft per gallon: about 1.9 gallons before waste
When to buy more paint
Add more paint when you are painting over a dark color, covering repaired drywall, using a lower-coverage paint, or painting textured surfaces.
Ordering one extra gallon is often cheaper than stopping mid-project and trying to match a second batch later.
Use the calculator
For a project-specific estimate, enter your measurements in the Paint Calculator.
Frequently asked questions
Does a 12x12 room always need two gallons?
No. Wall height, window size, paint coverage, color change, and coat count can change the estimate.
Should trim and doors be included?
Estimate trim, doors, and ceilings separately because they often use different paint and coverage assumptions.