Ceiling Paint Calculator
To paint a 12 × 14 ft ceiling (168 sq ft) with two coats of flat ceiling paint, exact (0% waste), you need 168 sq ft of coverage — 1 gallon, based on 350 sq ft of coverage per gallon for one coat (175 sq ft per gallon for two coats, the standard for a ceiling).
Reviewed by The ponderloop teamUpdated 2026-07-11How we calculate
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0 sq ft + 0% waste = 0 sq ft
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How this number is calculated
0 sq ft (no waste added) ÷ 175 sq ft per gallon = 0 gallons
Shopping list
- Ceiling paint (flat, 1 gallon)
- Paint roller kit (roller, tray, covers)
- Roller extension pole
- Angled sash paintbrush (2.5 inch)
- Painter's tape
- Canvas drop cloth
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Methodology & assumptions
Ceiling area is ceiling length times ceiling width, using this tool's inputs directly. That area is divided by coverage per gallon — a 350 sq ft/gal baseline for one coat of flat ceiling paint, halved for the standard two-coat application — then multiplied by your chosen waste percentage and rounded up to the next whole gallon.
- Manufacturer coverage specs (~350 sq ft/gal, one coat, flat ceiling paint)
- Typical US ceiling paint retail price range, 2026
Worked examples
| Room | Result |
|---|---|
| 12 × 14 ft ceiling, 2 coats, exact | 168 sq ft, exact (0% waste) → 1 gallon |
| 20 × 15 ft ceiling, 2 coats, +10% waste | 300 sq ft + 10% waste ≈ 330 sq ft → 2 gallons |
| 12 × 12 ft ceiling, 1 coat (same-color refresh), +10% waste | 144 sq ft + 10% waste ≈ 158.4 sq ft → 1 gallon |
Frequently asked questions
- How many gallons of ceiling paint do I need?
- Multiply the ceiling length by its width in feet to get the square footage, then divide by the coverage per gallon for your number of coats. One coat covers about 350 sq ft per gallon; two coats (the standard for a ceiling) effectively halves that to about 175 sq ft per gallon.
- Why do ceilings usually need two coats?
- Flat ceiling paint has very low sheen, which makes roller overlap marks and thin spots more visible under raking light from windows and fixtures than a single coat can reliably hide. Two coats is the standard recommendation even when the color is not changing.
- Should I use ceiling paint or regular wall paint on a ceiling?
- Dedicated ceiling paint is thicker and flatter than wall paint, which helps it resist drips while rolling overhead and hides surface imperfections better. It also usually comes in one bright-white shade rather than custom tint options, which is why most ceilings are still white even in a colorful room.
- What ceilings need more paint than the 350 sq ft/gal baseline?
- Textured or "popcorn" ceilings have far more surface area per sq ft of floor plan than a flat ceiling and soak up noticeably more paint — budget an extra gallon on a large textured ceiling. Unprimed drywall (common on new construction or after a popcorn-ceiling removal) is also more porous and needs a primer coat, or extra paint, before finish coats.
- Should I round up or buy an extra gallon of ceiling paint?
- Always round up to the next full gallon. Ceiling paint is inexpensive relative to the setup cost of re-taping and rolling overhead again, so it rarely pays to cut it close.