How Much Paint Does a 15x15 Room Need?
A 15x15 room with 8ft ceilings has 480 square feet of gross wall area. After deducting a door and two windows, the paintable wall area is approximately 425 square feet. At 400 square feet per gallon and two coats, that equals about 2.1 gallons — buy 2.5 gallons (two gallons plus a quart) to be safe.
The 15x15 ceiling is 225 square feet. One gallon of ceiling paint is enough for two ceiling coats with some remaining.
In litres, a 15x15 room needs 8 to 10 litres for two wall coats. Two 5 litre tins is the cleanest purchase for this size room.
15x15 Room Paint — Reference Table
| Surface | 1 Coat | 2 Coats | Litres (2 coats) |
|---|---|---|---|
| Walls only | ~1.2 gal | ~2.4 gal | ~9.1 litres |
| Ceiling only | ~0.56 gal | ~1.1 gal | ~4.2 litres |
| Walls + ceiling | ~1.76 gal | ~3.5 gal | ~13.2 litres |
| Accent wall only | ~0.3 gal | ~0.6 gal | ~2.3 litres |
Tips for Painting a 15x15 Room
Buy 2.5 gallons minimum for two wall coats — two gallons alone will leave you just short in a 15x15 room.
A 15x15 room is a comfortable size for an accent wall — one bold wall uses about 0.6 gallon for two coats, while the remaining three walls use about 1.8 gallons.
Mix all paint in a single bucket if using multiple cans of the same colour — this is called boxing and ensures consistent colour throughout the room.
Use an extension pole on your roller to work efficiently without constantly moving a step ladder.
Plan your paint order: ceiling first, then the accent wall if applicable, then the remaining walls, and trim last.
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Frequently Asked Questions
How many gallons for a 15x15 room?
Buy 2.5 gallons for two coats on the walls. Add another gallon if you are also painting the ceiling, bringing the total to 3.5 gallons.
Is 2 gallons enough for a 15x15 room?
2 gallons is just enough for one coat on the walls. For two coats (recommended), you need 2.5 gallons minimum.
How many litres for a 15x15 room?
A 15x15 room needs 8 to 10 litres for two wall coats. Two 5 litre tins is the most straightforward purchase for this room size.
How much paint for an accent wall in a 15x15 room?
A 15ft accent wall at 8ft ceiling height is 120 sq ft. You need about 0.6 gallon for two coats — one quart is enough if your paint has good coverage.
How long does it take to paint a 15x15 room?
Plan for 6 to 8 hours for two wall coats plus prep. Adding the ceiling adds another 1.5 to 2 hours.
What finish for a 15x15 living room or bedroom?
Eggshell for bedrooms and formal living rooms. Satin for living rooms with children, pets, or heavy use. Both clean easily and look professional.