How much paint for a 10x12 room?
A 10x12 room needs 1.81 gallons for two coats over 316 sq ft of wall, so two gallons is the buy, but the waste allowance is already spent getting there.
A 10x12 ft room with 8-foot ceilings needs 1.81 gallons of paint for two coats — buy 2 × 1-gallon cans. That is 352 sq ft of gross wall, 316 sq ft after deducting one door (21 sq ft) and one window (15 sq ft), covered twice against 350 sq ft per gallon. With the standard 10% waste buffer it comes to 1.99 gallons, about $80 of paint. Having it painted runs about $441 for the walls, or $770 with the ceiling and trim.
Rates and coverage figures updated August 2026. Compiled 2026 from sources last updated 2023–2026.What to actually buy
- 2 × 1-gallon cans of wall color — $80, leaving 0.01 gal spare.
- On the walls, rounding up to 2 full gallons instead costs $80 and leaves 0.01 gal you will not use.
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What a 10x12 room is, and what that means for the job
Two long walls do the work in a 10x12 and two short ones get in the way. In a house it is usually the guest bedroom, the smaller of two kids' rooms, or a dining room that never lost its walls. A queen bed on a 10 ft wall leaves about a foot at each side, so the bed almost always ends up along a 12 ft wall, which means one long run is blocked by a headboard you slide out rather than lift.
The window count is where these rooms split. A dining room on an exterior corner can carry two windows and a cased opening instead of a door, and every one of those subtracts wall. The 316 sq ft here assumes one door and one window, so a room with more openings needs less paint, not more. Ceilings get painted in a dining room, where people sit and look across them, and skipped in a guest room nobody sleeps in. Sheen splits the same way, and the sheen guide covers it.
The numbers behind the answer
| Ceiling height | Gross wall | Net wall | 1 coat | 2 coats | 2 coats + waste |
|---|---|---|---|---|---|
| 8 ft | 352 | 316 | 0.90 | 1.81 | 1.99 |
| 9 ft | 396 | 360 | 1.03 | 2.06 | 2.26 |
| 10 ft | 440 | 404 | 1.15 | 2.31 | 2.54 |
The arithmetic is worth seeing once: 352 sq ft of gross wall comes from 2 × (10 + 12) × 8 ft. Take off 21 sq ft for the door and 15 for the window and you have 316 sq ft to cover. Two coats is 632 sq ft of coverage, and at 350 sq ft per gallon that is 1.81 gallons. Every figure on this page comes from that one calculation.
A 10x12 room needs exactly the same paint as a 11x11 (121 sq ft of floor). All of them measure 44 feet around, so all of them have 316 sq ft of wall to cover and all of them take 1.81 gallons — even though the 10x12 has 120 sq ft of floor and the 11x11 has 121. Wall paint follows the perimeter, not the floor area. Stretching a room in one direction while shrinking it in the other changes how much carpet you buy and not how much paint.
What to buy
Buy exactly two gallons. You need 1.81 for two coats and 1.99 once the 10% waste allowance is on, so a two-gallon buy is right down to the last hundredth, which is another way of saying there is no reserve in it. If the new color is going light over dark, or the drywall is thirsty, put a quart in the cart now rather than driving back for one. At about $16 it is cheap insurance on an $80 job.
Painting the ceiling and trim too
| Surface | Area | Paint, 2 coats | Buy |
|---|---|---|---|
| Walls | 316 sq ft net | 1.99 gal | 2 × 1-gallon cans |
| Ceiling | 120 sq ft | 0.75 gal | 1 × 1-gallon can |
| Trim and baseboard | 41 linear ft | 0.18 gal | 1 × quart |
What changes the answer
Two gallons only holds at 8 ft. Raise the ceiling to 9 ft and that extra foot around 44 ft of perimeter puts you at 2.06 gallons; at 10 ft it is 2.31, and either one turns this into a three-container buy. A second window works the other way, taking 15 sq ft of wall out and bringing you down to about 1.72. The change that really hurts a dining room is a drastic color shift over an old dark red: three coats instead of two is 2.71 gallons, and no amount of quart-buying rescues a two-gallon plan. Run other sizes through the quick estimator.
| Change | Paint needed | Effect |
|---|---|---|
| Baseline | 1.81 gal | the figure this page answers with |
| 9 ft ceiling | 2.06 gal | crosses two gallons |
| 10 ft ceiling | 2.31 gal | crosses two gallons |
| Orange-peel texture | 1.94 gal | +0.14 gal |
| Knockdown texture | 2.30 gal | crosses two gallons |
| Three coats | 2.71 gal | crosses two gallons |
| A second window | 1.72 gal | −0.09 gal — an opening removes wall you would have had to cover |
| No window at all | 1.89 gal | +0.09 gal |
Doing it yourself against hiring it out
| Route | What you pay | What it takes |
|---|---|---|
| Do it yourself | $80 of paint, plus roughly $16 of sundries | 2 × 1-gallon cans, one weekend |
| Hire it out | $441 for walls only | about 5.8 painter-hours |
| Hire it out, full room | $770 with ceiling and trim | walls, ceiling and 41 ft of trim |
A single room can also fall under a painter's job minimum, which runs $250–$500 whatever the square footage covers — mobilizing a crew costs the same for one room as for five. If you are pricing work rather than buying paint, the painting estimate calculator builds the full line-itemed bid.
A 10x12 room, answered
How much paint do I need for a 10x12 room?
1.81 gallons for two coats, bought as two. The room is 44 ft around, which at 8 ft gives 352 sq ft; one 21 sq ft door and one 15 sq ft window come out and leave 316 sq ft. Painting that twice at 350 sq ft per gallon is 1.81 gallons, and 1.99 once you allow 10% for waste. Two gallons clears that by a hundredth, which is close enough to plan around but not close enough to be casual with.
Why does a 10x12 room need the same paint as an 11x11 room?
Both rooms are 44 ft around, so both come to 316 sq ft of net wall and 1.81 gallons. They do not feel alike. A 10x12 has two long walls and two short ones; an 11x11 has four the same, and the work of moving around them is different. The tape says otherwise. Perimeter times ceiling height is the surface you paint, and the floors, 120 sq ft against 121, never enter the arithmetic at all.
How much does it cost to paint a 10x12 room?
About $80 in materials against roughly $441 for a crew. Two gallons at $40 is the whole paint bill, and the same two cans run near $40 total in builder grade or $160 in premium. The $441 prices 316 sq ft of paintable wall at just under $1.40 per sq ft, the lower half of the $1.00 to $3.00 band. One 10x12 alone can still land under a $250 to $500 job minimum, so ask what the minimum is before you ask the rate.
Does a chair rail change how much paint a 10x12 dining room needs?
The total stays 1.81 gallons, but you cannot buy it as two cans. A 36 in chair rail splits the 316 sq ft of wall roughly 62/38 by height, so plan about 1.13 gallons for the color above and 0.68 below. With waste that is a gallon plus a quart of the upper color and three quarts of the lower: five containers, more money, and two sheens to keep straight. The wall area does not change. Only the packaging does.
Sources and method
Coverage rates come from Sherwin-Williams and Benjamin Moore product data sheets; cost ranges were compiled in August 2026 from HomeGuide and Angi/HomeAdvisor, whose own pages date from 2023 to 2026. Angi owns HomeAdvisor, so those are one source and not two. Quantities on this page assume 350 sq ft per gallon per coat on smooth primed drywall, a 21 sq ft door and a 15 sq ft window; sources put windows anywhere from 10 to 16 sq ft, so change the opening counts in the calculator if yours differ. The full constants are on the paint coverage chart, and the cost basis is set out on interior painting cost per square foot.
This is an estimate for planning, not a quote. Measure your own room before buying.