Paint calculators
Ceiling Paint Calculator
The ceiling is the wall everyone forgets. It is also the easiest surface to estimate — a flat rectangle, no doors or windows to subtract. Yet people routinely buy a whole extra gallon "just in case" for a 144-square-foot ceiling that needs less than half a gallon per coat.
Enter your ceiling's length and width and pick your coats. If it is a popcorn or heavily textured ceiling, check the box — texture drinks paint, and the calculator budgets roughly 25% extra for it. The result rounds up to the nearest quart, because that is the smallest unit worth buying.
- Ceiling area
- 144 sq ft
- Ceiling paint needed
- 1 gallon1.00 gal · 2 coats at ~350 sq ft/gal
How we calculate this (with your numbers)
Ceiling area = 12 × 12 = 144 sq ft
Paint = 144 × 2 coats ÷ ~350 sq ft/gal = 0.82 gal → 1 gallon (rounded up to the nearest quart)
How the math works
Worked example
A 15 × 20 ft living room ceiling, flat, 2 coats:
- Area = 15 × 20 = 300 sq ft
- Paint = 300 × 2 ÷ 350 = 1.71 gallons
- Rounded up: 1 gallon + 3 quarts
Same ceiling with popcorn texture: 300 × 2 ÷ 280 = 2.14 gallons → 2 gallons + 1 quart. That extra quart is the texture tax.
Limitations
Frequently asked questions
A 12×12 ft ceiling is 144 square feet — under half a gallon per coat at 350 sq ft per gallon. Most ceilings need about one gallon per coat for an average bedroom, two for a large living room. Use the calculator above with your exact dimensions.
Yes — budget roughly 25% more than a flat ceiling of the same size (an estimate; very heavy texture may need more). Texture traps paint, and you cannot stretch it the way you can on a smooth wall. Check the textured box in the calculator and it adjusts automatically.
Flat ceiling paint — it hides imperfections and does not reflect light unevenly. Ceiling-specific paints are also formulated to spatter less when rolled overhead. Standard wall paint works, but flat finish looks better up there.
Usually one to two. A previously white ceiling in good shape often covers in one coat; stained, patched, or color-changed ceilings need two, sometimes over a stain-blocking primer.
Ceiling first, then walls, then trim — the standard pro order. Any roller spatter from the ceiling lands on unpainted walls, where the wall coats will cover it.
Related calculators & guides
- Interior paint calculator — walls for the same room
- Paint cost calculator — add the ceiling gallons to your budget
- Primer calculator — for stained ceilings that need sealing first
- How much paint for a 12×12 room — walls + ceiling together