How Much Paint for a 11x12 Room?
A 11×12 ft room with 8 ft ceilings has 318 sq ft of paintable wall. Two coats take 1.82 gallons, so buy 2 gallons of wall paint. Adding the ceiling brings the total to 2.57 gallons (3 gallons).
Paint needed for a 11x12 room
| Scenario | Paintable area | Exact gallons | Buy |
|---|---|---|---|
| Walls, 1 coat | 318 sq ft | 0.91 | 1 gallon |
| Walls, 2 coats | 318 sq ft | 1.82 | 2 gallons |
| Ceiling, 2 coats | 132 sq ft | 0.75 | 1 gallon |
| Walls + ceiling, 2 coats | 450 sq ft | 2.57 | 3 gallons |
| Walls, 2 coats, 9 ft ceiling | 364 sq ft | 2.08 | 3 gallons |
Assumes 1 door (20 sq ft) and 2 windows (15 sq ft each) deducted, 350 sq ft per gallon, 8 ft ceiling unless stated. Trim and doors not included.
How it is calculated
Walls: 2 × (11 + 12) × 8 = 368 sq ft
Minus door and windows: 368 − 50 = 318 sq ft
Two coats: 318 × 2 ÷ 350 = 1.82 gallons → 2 gallons
Ceiling: 11 × 12 = 132 sq ft → 132 × 2 ÷ 350 = 0.75 gallons
Tips for a 11x12 room
- You need 1.82 gallons, so 2 gallons leaves about 0.7 quarts spare – enough for touch-ups. Do not bother with a 5-gallon bucket.
- Cutting in with a brush runs 46 ft along the ceiling line and another 46 ft along the baseboards, before counting door and window frames.
- The 132 sq ft ceiling needs only 0.75 gallons for two coats, so a quart or a gallon of ceiling paint is plenty.
Frequently asked questions
How many gallons of paint for a 11x12 room?
With 8 ft ceilings the walls total 2 × (11 + 12) × 8 = 368 sq ft. After deducting 50 sq ft for one door and two windows, 318 sq ft remain. Two coats at 350 sq ft per gallon is 1.82 gallons, so buy 2 gallons. One coat needs 0.91 gallons.
How much paint for the walls and ceiling of a 11x12 room?
The ceiling adds 132 sq ft. Walls plus ceiling, two coats, comes to 2.57 gallons, so buy 3 gallons. The ceiling alone needs 0.75 gallons for two coats.
How much does it cost to paint a 11x12 room?
Paint for the walls (2 gallons) costs roughly $50–$120 at $25–$60 per gallon. With 9 ft ceilings you would need 2.08 gallons, so 3 gallons. Primer, tape and supplies are extra.