Gallons needed by room size, coverage table,
formula, and printable shopping list for ceiling paint.
Quick answer
One gallon of ceiling paint covers
350–400 sq ft per coat
on a smooth primed ceiling.
A 12×12 room ceiling
needs 1 gallon for two coats.
For rooms larger than 200 sq ft plan on 2 gallons for two coats.
Calculate Your Ceiling
- 1 gallon flat white ceiling paint
- 9-inch roller with 3/8 inch nap
- Extension pole for overhead reach
- Roller tray and liner
- Painter’s tape for edges
Ceiling Paint Needed by Room Size
Coverage rate: 400 sq ft per gallon on smooth primed ceilings.
| Room Size | Ceiling Sq Ft | 1 Coat | 2 Coats |
|---|---|---|---|
| 10×10 | 100 sq ft | 1 quart | 1 gallon |
| 12×12 | 144 sq ft | 1 gallon | 1 gallon |
| 12×15 | 180 sq ft | 1 gallon | 1 gallon |
| 14×16 | 224 sq ft | 1 gallon | 2 gallons |
| 15×20 | 300 sq ft | 1 gallon | 2 gallons |
| 20×20 | 400 sq ft | 1 gallon | 2 gallons |
The Formula
Gallons = ceiling sq ft × coats ÷ coverage per gallon
Ceiling square footage is simply length × width.
No doors or windows to deduct — unlike wall paint calculations.
Example — 12×12 room, 2 coats
- Ceiling area = 12 × 12 = 144 sq ft
- 144 × 2 coats ÷ 400 coverage = 0.72
- Round up: 1 gallon
includes a ceiling toggle. Turn it on, enter your ceiling
dimensions separately, and it adds ceiling paint to your
total shopping list alongside wall paint and primer.
How Much Ceiling Paint for Large Areas
For whole-house painting or large open-plan spaces,
calculate each room ceiling separately and add them together.
| Total Ceiling Area | 1 Coat | 2 Coats |
|---|---|---|
| 400 sq ft | 1 gallon | 2 gallons |
| 800 sq ft | 2 gallons | 4 gallons |
| 1,500 sq ft | 4 gallons | 8 gallons |
| 2,000 sq ft | 5 gallons | 10 gallons |
Ceiling Paint vs Wall Paint — What Is the Difference?
| Feature | Ceiling Paint | Wall Paint |
|---|---|---|
| Finish | Flat — hides roller marks | Eggshell, satin, semi-gloss |
| Formula | Thicker — drip resistant | Standard viscosity |
| Coverage | 350–400 sq ft per gallon | 350–400 sq ft per gallon |
| Typical color | Bright white or off white | Any color |
| Can use on walls? | Yes — but flat finish less durable | Standard use |
Frequently Asked Questions
How much ceiling paint do I need for a 12×12 room?
A 12×12 ceiling is 144 sq ft. At 400 sq ft per gallon
coverage you need 0.72 gallons for two coats — round up to
1 gallon. One gallon is enough for two full coats on a
standard 12×12 ceiling.
How many gallons of paint do I need for 1,500 sq ft of ceiling?
For 1,500 sq ft of ceiling at standard 400 sq ft per gallon
coverage you need 4 gallons for one coat or 8 gallons for
two coats. Buy in 5-gallon buckets for projects this size —
it is cheaper per gallon than individual gallons.
How many coats of ceiling paint do I need?
Two coats is standard for most ceiling paint projects.
One coat may be enough when painting the same color over
a similar shade. New drywall, stained ceilings, or significant
color changes always need two coats.
What coverage does ceiling paint have per gallon?
Most ceiling paints cover 350–400 sq ft per gallon on a
smooth primed surface. Textured or popcorn ceilings absorb
more and may cover only 250–300 sq ft per gallon.
Can I use regular wall paint on a ceiling?
Yes. Regular latex paint works on ceilings but ceiling
paint is designed specifically for overhead application —
it is thicker to reduce dripping and has a flat finish
that hides roller marks better than eggshell or satin wall paint.
Related Calculators
- Paint Calculator —
walls, ceiling, primer, and trim in one calculation
with multiple rooms - Flooring Calculator —
square footage for hardwood, LVP, or laminate - Tile Calculator —
tiles, boxes, and waste factor for any floor or wall