How Much Paint Does a 12x12 Room Need?
A 12x12 room with 8ft ceilings has 384 square feet of gross wall area. After deducting a standard door (20 sq ft) and one window (15 sq ft), the paintable wall area is around 349 square feet. At 400 square feet per gallon with two coats, that equals about 1.75 gallons — most homeowners buy 2 gallons to have some left over for touch-ups.
If you are also painting the ceiling, add another half gallon. The 12x12 ceiling is 144 square feet, which is well under one gallon for two coats. A single quart may even be enough if you are applying only one coat of ceiling paint.
In litres, a 12x12 room needs 6 to 8 litres for two coats on the walls. A 5 litre tin is just enough for one coat; buy a 5 litre plus a 2.5 litre tin to be safe for two coats.
12x12 Room Paint — Reference Table
| Surface | 1 Coat | 2 Coats | Litres (2 coats) |
|---|---|---|---|
| Walls only | ~1 gal | ~2 gal | ~7.5 litres |
| Ceiling only | ~0.4 gal | ~0.8 gal | ~3 litres |
| Walls + ceiling | ~1.4 gal | ~2.8 gal | ~10.5 litres |
| Trim & baseboards | ~0.25 gal | ~0.5 gal | ~1.9 litres |
Best Paint Finish for a 12x12 Room
Eggshell or satin are the best finishes for a 12x12 room whether it is a bedroom, office, or spare room. Eggshell gives a soft, low-sheen finish that hides minor wall imperfections and looks clean and refined. Satin is slightly more durable and easier to wipe clean — ideal if the room sees regular use.
Avoid flat or matte paint on walls if the room is in regular use. Flat paint cannot be scrubbed without damaging the surface and will show marks and fingerprints over time.
Tips for Painting a 12x12 Room
Use a roller with a 3/8 inch nap for smooth walls and a 1/2 inch nap for textured or orange-peel walls.
Cut in first with a brush along all edges, corners, ceiling line, and baseboards before rolling the main wall areas.
Always buy one extra quart beyond your estimate so you have touch-up paint for the next 1 to 2 years.
Two coats are always better than one — even with good coverage paint, a second coat evens out the finish and ensures full opacity.
Allow 2 to 4 hours drying time between coats for latex paint. Do not rush the second coat or you risk lifting the first.
Related Paint Calculators
- Bedroom Paint Calculator →
- Living Room Paint Calculator →
- How Much Paint for a 10x10 Room? →
- How Much Paint for a 12x14 Room? →
- How Much Paint for a 14x14 Room? →
- Paint Coverage Calculator →
- Free Paint Calculator →
Frequently Asked Questions
How many gallons of paint for a 12x12 room?
You need about 2 gallons for two coats on the walls of a 12x12 room with 8ft ceilings. If you are also painting the ceiling, add another gallon.
Is one gallon enough for a 12x12 room?
One gallon is enough for a single coat. For two coats — which are recommended for a professional finish — you will need 2 gallons.
How many litres of paint for a 12x12 room?
A 12x12 room needs 7 to 8 litres for two coats on the walls. A 5 litre tin plus a 2.5 litre tin is the most common purchase for this size room.
Does a 12x12 room need primer?
Primer is needed if painting over bare drywall, a very dark colour, or water stains. For repainting over an existing similar colour, a paint-and-primer-in-one product is sufficient.
How long does it take to paint a 12x12 room?
Most DIYers complete a 12x12 room in 4 to 6 hours including prep, two wall coats, and drying time between coats.
What is the best paint finish for a 12x12 room?
Eggshell or satin are the best finishes. They are easy to clean, resist scuffs better than flat paint, and give a professional-looking result on smooth walls.