How Much Paint for a 10×10 Room?
A 10×10-ft room with 8-ft ceilings takes 2 gallons of paint for two coats on the walls, or 3 gallons for two coats on the walls plus the ceiling. The assumptions are one interior door, two windows, and standard latex covering 350 sq ft per gallon. Ten by ten is the classic spare bedroom, home office, or nursery footprint, and it sits right at the size where two gallons genuinely finishes the job with margin to spare.
The math, step by step
- Gross wall area: 2 × (10 + 10) × 8 = 320 sq ft.
- Subtract openings: 20 sq ft for the door, 15 sq ft per window × 2 = 50 sq ft total, leaving 270 sq ft of wall.
- Ceiling: 10 × 10 = 100 sq ft, for 370 sq ft paintable in total.
- Waste factor: 370 × 1.10 = 407 sq ft to buy for.
- Per coat: 407 ÷ 350 = 1.16 gallons.
- Two coats: 1.16 × 2 = 2.33 gallons, rounded up to 3 gallons.
Walls only runs the same way on a smaller number: 270 sq ft becomes 297 sq ft with waste, which is 0.85 gallons per coat and 1.70 for two — so 2 gallons. The ceiling is what pushes a 10×10 room over the two-gallon line, because 100 sq ft of flat ceiling is a surprisingly large share of a small room's total surface.
Nearby scenarios for a 10×10 room
| Scenario | Paintable area | With 10% waste | Buy |
|---|---|---|---|
| Walls only, 1 coat, 8-ft ceiling | 270 sq ft | 297 sq ft | 1 gallon |
| Walls only, 2 coats, 8-ft ceiling | 270 sq ft | 297 sq ft | 2 gallons |
| Walls + ceiling, 1 coat, 8-ft ceiling | 370 sq ft | 407 sq ft | 2 gallons |
| Walls + ceiling, 2 coats, 8-ft ceiling | 370 sq ft | 407 sq ft | 3 gallons |
| Walls only, 2 coats, 9-ft ceiling | 310 sq ft | 341 sq ft | 2 gallons |
| Walls + ceiling, 2 coats, 9-ft ceiling | 410 sq ft | 451 sq ft | 3 gallons |
| Walls + ceiling, 2 coats, only 1 window | 385 sq ft | 424 sq ft | 3 gallons |
| Walls + ceiling, 3 coats (deep color), 8-ft ceiling | 370 sq ft | 407 sq ft | 4 gallons |
A 10×10 room is stable across most of these changes — going from an 8-ft to a 9-ft ceiling does not add a can, and neither does losing a window. Only the third coat moves the number, and that is the one variable worth deciding before you go to the store.
That link loads with the length and width already set to 10. Adjust for your exact room — most "10×10" spaces are really 9'8" by 10'4" or similar, and a closet doorway or a second window changes the door and window counts.
Common questions
Is one gallon enough for a 10×10 room?
For a single coat on the walls only, yes — 297 sq ft with waste fits inside one 350 sq ft gallon with room left. For anything more ambitious than that it is not. Two coats on the walls is 1.70 gallons of actual paint, so a single can leaves you a full wall short and forced into a second trip with a freshly tinted batch that may not match perfectly.
Do small rooms need less primer?
Proportionally the same, but the absolute quantity is small enough that a single gallon of primer covers a 10×10 room's walls and ceiling in one pass with about a third of the can left. If you are priming bare drywall, ask the paint counter to tint the primer toward your finish color — in a small room that usually turns a planned two topcoats into one.
What do I do with the leftover from 3 gallons?
Expect around two-thirds of a gallon back. Decant it into a clean quart so there is less air in the can, label it with the room and the color formula from the lid, and store it somewhere that never freezes. Latex paint kept that way stays usable for touch-ups for several years; a half-empty gallon in an unheated garage does not.
Related
- How much paint for a 12×12 room — the most-asked room size.
- How much paint for an average bedroom — the 10×10 to 14×16 range side by side.
- Paint cost per gallon in 2026 — what 2 or 3 gallons actually costs.
- Trim paint calculator — baseboard and casing runs, priced in quarts.
- Paint calculator — any dimensions, coats, doors, and windows.