How much paint for a 12x12 bedroom?
3 gallons of paint for a 12x12 bedroom, at the settings most people start with. Below the calculator are the same numbers for the alternatives you are likely to choose, and what each one does to the total.
Reviewed · Method: measured dimensions, industry coverage rates, rounded up to real package sizes · How the numbers are calculated
Values are pre-filled for this page. Change anything and hit Recalculate.
The answer, and what it is made of
12 x 12 ft at a 8 ft ceiling gives 478 sq ft of paintable wall and ceiling after openings. At 2 coats that is 3 gallons of paint of paint. The primer is a separate line: 2 gal on top of the topcoat budget, not instead of it.
Planning figure for everything on that list: $177 to $394, with $259 as the realistic middle for the products most people actually buy. These are estimates for budgeting, not quotes. Prices move by region and by season, and the middle figure assumes a mid-range product rather than the cheapest thing on the shelf.
Coats multiply rather than add: 3 gallons at 2 coats becomes 2 gallons at 2 coats. The step from one coat to two is the one that actually covers, which is why buying for a single coat almost never finishes the room.
What changes if you change one thing
| Change the number of coats | You buy |
|---|---|
| 1 coat over existing paint | 1 gallon |
| 2 coats, walls only | 2 gallons |
| 2 coats, walls and ceiling | 3 gallons |
Every row is a live calculation, not an estimate. The shaded row is what this page defaults to.
What goes in the cart
| Item | Quantity |
|---|---|
| Interior paint | 3 gal |
| Primer | 2 gal |
| Roller covers (3/8 in nap) | 2 pcs |
| Angled sash brush 2 in | 2 pcs |
| Painter's tape | 1 roll |
| Drop cloth | 2 pcs |
| Roller tray + liners | 1 set |
Buy a 5-gallon pail when the total is 4 gallons or more. It is cheaper per gallon and guarantees a single dye lot across connected rooms.
What this size actually changes
Three hundred and thirty-four square feet of wall and 144 of ceiling: at two coats that is 3 gallons including the ceiling, and 2 if you leave the ceiling alone. The 12x12 bedroom is the classic case where the ceiling is a fifth of the paint and half the awkward work, so deciding on it upfront is worth more than choosing the colour.
Figure. 12x12 bedroom: 12 x 12 ft. Measure the finished surface, not the room walls — the area between skirting or cabinet faces is the area you pay for.
How the quantity is worked out
Paint coverage is quoted at 350 to 400 sq ft per gallon per coat on a smooth, previously painted surface. Everything else reduces that number: bare drywall absorbs, a roller with a deep nap wastes, and a strong colour change takes three coats where two were planned. Two coats of the same colour over an existing similar colour is the one case where the label number holds.
Ceilings are the line item people forget. They are the same footprint as the floor, they take a full coat, and they are the slowest surface to paint because of the overhead work. If you are painting a room properly, the ceiling is usually one to two extra gallons on its own.
How to measure this job
Measure the room at floor level in both directions, at two points each, because bedrooms are rarely square and a 2 in difference across a 12 ft wall changes the last row. Measure the height from floor to ceiling at each corner for paint, and note where the ceiling drops for a bulkhead or a duct.
For flooring, include the closet if it is getting the same material — a 2x6 ft closet is 12 sq ft and is the item most often left out. For paint, count doors and windows precisely: each standard door is about 20 sq ft of wall you do not paint, and each window about 15.
Mistakes that cost real money
Buying for one coat
One coat only works over the same colour in the same finish. Changing from a dark colour, going from bare drywall, or moving between sheens all need two coats minimum, and a strong colour change needs three. Buying for one coat means a second trip mid-job, in a different batch.
Assuming the room is square
Bedrooms in houses older than about thirty years are almost never square. If the two width measurements differ by more than an inch, the last row of tile or flooring will be a taper, and you need extra material to handle it. Measure both ends of every wall.
Buying three gallons before testing the colour
A 12x12 bedroom needs about 2 gallons for the walls. Buying 3 locks you into a colour you have only seen on a chip. Buy a sample pot, paint two patches on different walls, and live with it for a day.
Cutting in around a room this size without a plan
Bands of cutting-in take about as long as rolling. On 334 sq ft of wall, cut in one wall completely, roll it, then move on. Cutting in the whole room first means the first wall is dry before you roll it, and you get a visible edge.
Frequently asked questions
How much does a gallon of paint cover?
About 350 to 400 sq ft per coat on a smooth, sealed surface. Expect the low end on bare or porous drywall, on a deep-nap roller, and on heavily textured walls. Rough surfaces can drop coverage to 250 sq ft per gallon, which turns a three gallon job into four.
How much flooring for a 12x12 bedroom?
A 144 sq ft room needs about 156 sq ft with 8 percent waste, which is 7 cartons at 24.5 sq ft. Add the closet separately, and add another carton if the room is out of square or you are laying the planks diagonally.
How much paint for a 12x12 bedroom?
Two gallons for two coats on the walls, three if you include the ceiling, assuming one door and two windows. A dark colour going lighter, or bare drywall, needs a coat more and therefore a gallon more.
Should I paint the ceiling the same colour as the walls?
White is standard because it reflects light and makes the room feel taller. The same colour on walls and ceiling makes a small bedroom feel like a box, though it can look deliberate in a room with good natural light. Either way, ceiling paint is cheaper than wall paint.
What will the materials for this cost?
A planning range of $177 to $394 for everything in the shopping list, with $259 as the realistic middle. That is materials only: it excludes labour, delivery, tool hire and disposal of the old surface. Treat it as a budgeting figure, not a quote.