How Much Paint Do I Need for a Ceiling?
Quick answer: a gallon of ceiling paint covers 350–400 sq ft per coat. A 12×12 ceiling (144 sq ft) fits in 1 gallon for two coats; a 20×20 ceiling (400 sq ft) needs 2 gallons for two coats. Textured ceilings drop coverage to about 250–300 sq ft per gallon.
- The ceiling formula
- How many coats
- Flat vs eggshell
- Textured ceiling coverage
- Worked example: 12×12 room
- FAQ
The ceiling formula
Ceilings are the easiest surface to measure: length × width of the room. No windows, no doors — just the flat overhead area. A 12×16 room has a 192 sq ft ceiling. From there, coverage is the same math as walls: total area ÷ coverage per gallon (350–400 sq ft), multiplied by the number of coats.
How many coats
Plan two coats on new drywall — the first coat soaks into the joint compound and the second gives a uniform finish. Repainting an already-white ceiling in the same color can be one coat, but two coats cover stains and patch marks reliably. Cutting in the edges with a brush doesn't add to the gallon count meaningfully.
Flat vs eggshell
Use flat or matte on ceilings. It hides drywall imperfections and doesn't glare under lights. Eggshell or satin belongs only in bathrooms and laundry rooms where the ceiling needs to be washable — at the cost of showing every flaw. White is the default; tinting slightly lighter than the walls keeps the room feeling taller.
Textured ceiling coverage
Popcorn and knockdown textures drink paint. Coverage drops to about 250–300 sq ft per gallon on heavy texture. Plan on 1 gallon per coat for a 12×12 popcorn ceiling instead of stretching one gallon over two coats — or rent a texture sprayer for large rooms.
Worked example: a 12×12 bedroom ceiling
- Ceiling area = 12 × 12 = 144 sq ft
- Two coats = 288 sq ft of coverage needed
- 1 gallon at 350 sq ft/coat covers 144 sq ft × 2 = 1 gallon
- Popcorn texture: 144 × 2 ÷ 275 = ~1.05 → 1–2 gallons
FAQ
One gallon of ceiling paint covers about 350–400 sq ft per coat. A 12×12 ceiling (144 sq ft) needs 1 gallon for two coats; a 20×20 ceiling needs 2 gallons for two coats.
Yes — two coats on new drywall (the first soaks into the joint compound). Repainting an already-white ceiling in the same color can be one coat, but two coats give a uniform finish.
Use flat or matte — it hides drywall imperfections and doesn't glare. Eggshell or satin only on bathroom ceilings, where washability matters more than hiding flaws.
About 350–400 sq ft per gallon per coat for interior flat paint. Textured or popcorn ceilings cut coverage to roughly 250–300 sq ft per gallon.
A gallon covers about 250–300 sq ft on popcorn texture. A 12×12 popcorn ceiling still fits in one gallon per coat — buy 2 gallons for two coats.