How Much Paint Does a Ceiling Need?
Ceiling paint coverage is straightforward to calculate — it is simply the floor area of the room. A 12x12 room has a 144 sq ft ceiling. At 400 sq ft per gallon, one gallon covers the ceiling for 2.7 coats — so one gallon is more than enough for two coats with some left over.
A large 20x20 room has a 400 sq ft ceiling — exactly one gallon per coat, meaning you need 2 gallons for two coats. Very large open-plan ceilings may need 3 or more gallons.
Textured ceilings (popcorn, knockdown) absorb 20 to 30% more paint than smooth ceilings. Always add a 25% buffer to your estimate for textured surfaces.
Ceiling Paint — Reference Table by Room Size
| Room Size | Ceiling Area | 1 Coat | 2 Coats |
|---|---|---|---|
| 10x10 | 100 sq ft | ~0.25 gal | ~0.5 gal |
| 12x12 | 144 sq ft | ~0.36 gal | ~0.72 gal |
| 14x14 | 196 sq ft | ~0.5 gal | ~1 gal |
| 15x20 | 300 sq ft | ~0.75 gal | ~1.5 gal |
| 20x20 | 400 sq ft | ~1 gal | ~2 gal |
Best Paint for Ceilings
Always use flat or matte white ceiling paint rather than standard wall paint applied overhead. Ceiling-specific paints are formulated to resist drips and spatters when applied overhead, dry without sheen, and hide roller marks and imperfections better than wall paint.
For bathrooms and kitchens, use a ceiling paint with a mould and mildew resistant formula. The extra moisture in these rooms can cause standard ceiling paint to bubble or grow mould over time.
Tips for Painting a Ceiling
Paint the ceiling before the walls — any drips or spatters on the walls will be covered when you paint the walls afterward.
Use an extension pole on your roller to avoid working off a ladder. It is faster, safer, and produces more even coverage.
Work in natural light or use bright work lights so you can see missed spots. Ceiling paint is notoriously easy to miss in patches.
Apply with a thick nap roller (3/4 inch) for textured ceilings. The extra nap works paint into the texture effectively.
Cut in carefully along the ceiling-wall joint with an angled brush before rolling. This is the hardest part of painting a ceiling cleanly.
Related Paint Calculators
- Ceiling Paint Calculator →
- How Much Paint for a 12x12 Room? →
- How Much Paint for a Bedroom? →
- Textured Wall Paint Calculator →
- Paint Coverage Calculator →
- Two Coat Paint Calculator →
- Free Paint Calculator →
Frequently Asked Questions
How much ceiling paint do I need?
One gallon of ceiling paint covers 350 to 400 sq ft per coat. For a standard 12x12 ceiling (144 sq ft), one gallon is more than enough for two coats.
Do I need two coats of ceiling paint?
Yes — two coats are recommended for even, uniform coverage. Some white-on-white repaints may look fine with one coat, but two coats always produces a more professional result.
Can I use wall paint on the ceiling?
You can, but ceiling-specific paint is formulated to resist drips when applied overhead and hides roller marks better. It is worth using the right product for the ceiling.
How much paint for a textured popcorn ceiling?
Textured ceilings absorb 20 to 30% more paint. Add 25% to your standard estimate. Use a thick nap roller (3/4 inch) to work paint into the texture.
Should I paint the ceiling before or after the walls?
Always paint the ceiling first. Any drips or spatters on the walls will be covered when you paint the walls afterward.
What colour should I paint my ceiling?
Flat white is the most common ceiling colour. Painting the ceiling the same colour as the walls creates a cocoon effect popular in dining rooms and bedrooms. A slightly lighter version of the wall colour is a good compromise.