BuildCalc Guides · Paint
How Much Paint for a 10×10 Room?
The most-searched bedroom size — small primary bedrooms, kid's rooms, home offices. Here is the wall math, the ceiling math, and what to buy at the paint counter.
The math
Wall area first, with openings subtracted:
- Wall area = perimeter × ceiling height. (10 + 10 + 10 + 10) × 8 = 320 sq ft.
- Subtract one door (~20 sq ft for a 3 × 6.7 ft door) and one window (~15 sq ft): 320 − 35 = 285 sq ft of paintable wall.
- Two coats = 285 × 2 = 570 sq ft of coverage.
- Divide by gallon coverage (350 sq ft/gal): 570 ÷ 350 = 1.63 → 2 gallons of wall paint.
- Ceiling = 10 × 10 = 100 sq ft × 2 coats = 200 sq ft = 1 gallon (smallest available).
By ceiling height
Wall area grows linearly with ceiling height. Older homes often have 9 ft ceilings; modern builds and additions sometimes go to 10.
| Ceiling | Walls | After openings | 1 coat | 2 coats |
|---|---|---|---|---|
| 8 ft | 320 sf | 285 sf | 1 gal | 2 gal |
| 9 ft | 360 sf | 325 sf | 1 gal | 2 gal |
| 10 ft | 400 sf | 365 sf | 2 gal | 3 gal |
Assumes 1 door + 1 window (35 sq ft of openings) and 350 sq ft per gallon. Add 1 gallon for ceiling.
Which paint where
- Walls: eggshell or matte. Wipeable enough for fingerprints, low enough sheen to hide minor wall imperfections. Bathrooms and kitchens: bump up to satin.
- Ceiling: dedicated flat ceiling paint. Cheaper than wall paint, hides patches and roller marks, no glare from overhead lights.
- Trim, doors, window casings: semi-gloss or satin enamel. A quart of trim paint covers a typical room (one door, baseboards, window casings).
- Primer: skip if going over the same color or a similar tone. Use it on fresh drywall, stains, dark-to-light color changes, or over oil-based finishes.
Shopping list for a 10×10 room
- • 2 gallons wall paint (eggshell)
- • 1 gallon ceiling paint (flat)
- • 1 quart trim paint (semi-gloss)
- • 1 gallon primer if needed
- • 2 sleeves of 9-inch roller covers (medium nap for walls, smooth for trim)
- • 1 angled 2.5 inch trim brush
- • 1 roll of 1.88-inch painter's tape
- • 1 canvas drop cloth
Calculate for your own room
BuildCalc's paint calculator takes room dimensions, ceiling height, and the number of doors and windows — and returns gallons for one and two coats.
Open the paint calculator →FAQ
How many gallons of paint do I need for a 10x10 room?+
For walls only with one door and one window subtracted: about 285 sq ft × 2 coats = 570 sq ft of coverage = 2 gallons. For ceiling: 100 sq ft × 2 coats = 200 sq ft = 1 gallon. Total for the room: about 3 gallons.
How much paint do I need for two coats?+
Always plan for two coats on a color change or fresh drywall — that doubles your coverage needs. One coat is rarely enough for full color depth, especially with lighter or trendy mid-tone colors over a different base.
How much wall area does one gallon of paint cover?+
About 350 to 400 sq ft per gallon with one coat on smooth drywall. Rough textures (orange peel, knockdown, popcorn), porous primers, and dark-to-light color changes can cut that to 250 sq ft per gallon.
Should I paint the ceiling and walls the same color?+
No — use a flat or matte ceiling-specific paint for the ceiling (hides imperfections, no glare) and eggshell or satin for the walls (wipeable, holds up to traffic). The ceiling paint is also formulated to roll without dripping.
What finish should I use for a 10x10 bedroom?+
Walls: eggshell or matte (subtle, easy to clean). Trim and doors: semi-gloss or satin (washable, takes some abuse). Ceiling: flat ceiling paint. For bathrooms or kitchens at this size, step walls up to satin or semi-gloss for moisture resistance.
How much primer do I need for a 10x10 room?+
About 1 gallon for the walls if you are going over previously painted in a similar color, or if you are using a paint-and-primer-in-one. Use a dedicated primer (about 1 gallon) when going over fresh drywall, stains, dark colors, or oil-based finishes.
Related guides
- How much paint for a 12×12 room? — one size up, same math.
- How many sheets of drywall for a 12×12 room? — for finishing a wall before you paint it.