A 10 × 10 room needs about 1 gallon
Using these planning assumptions, the room has 269 sq ft of paintable wall area after standard openings. At 350 sq ft per gallon with a 10% waste allowance, the exact estimate is 0.85 gallons. We recommend buying 1 gallon — see the calculator result panel for the optimal container combination.
A realistic 10 × 10 project
The 10 × 10 geometry leaves 269 paintable wall sq ft after one door and two windows. A single maintenance coat with 10% extra uses only 0.85 gallon, so one gallon is normally sufficient when the existing color and finish are sound.
How this preset differs from the standard two-coat walls estimate
This comparison changes only the condition named in the page title. Both scenarios use one 21 sq ft door shortcut, two 15 sq ft window shortcuts, 350 sq ft/gal, and a 10% allowance, so the quantity change remains auditable.
| Scenario | Modeled surface | Exact paint | Whole-gallon purchase |
|---|---|---|---|
| Two coats, 8 ft walls, ceiling excluded | 269 sq ft walls | 1.69 gal | 2 gal |
| This page: 1 coat, 8 ft walls | 269 sq ft modeled surface | 0.85 gal | 1 gal |
| Difference before rounding | -0.85 gal | Container rounding can magnify or hide a small volume change. | |
Use the one-coat scenario only for a compatible maintenance coat with acceptable hiding after drying; repairs or a strong color change can require primer or another finish coat.
What is distinctive about this size?
One coat is appropriate only when coverage is genuinely uniform. Patchy repairs, marker stains, or a strong color shift can turn this into a two-coat job, so inspect the first dry wall before declaring the quantity final.
The estimated remainder is about 0.15 gallon. Transfer a small amount to a labeled airtight touch-up container to reduce the air space that would make a nearly empty can skin over.
Calculation for this room
| Room perimeter | 40 ft |
|---|---|
| Gross wall area | 320 sq ft |
| Door and window deduction | 51 sq ft (one door + two windows) |
| Coats | 1 |
| Calculated paint | 0.85 gal |
Tips for a 10 × 10 room
For a same-color refresh in a compact room:
- Remove or cover furniture before painting — aim for a clear 3-foot workspace around each wall.
- Paint the ceiling first if included, then work top-down on walls to catch drips.
- Cut in edges with a 2½-inch angle brush before rolling for clean lines at corners and trim.
- If this is a frequently used room, choose a washable paint finish (eggshell or satin) for easier cleaning.
Before buying paint
This result is a starting point, not a substitute for the product label. Textured walls, fresh drywall, unsealed patches, and dramatic color changes reduce effective coverage. Measure oversized doors and windows separately, and calculate trim or closets as separate surfaces.
- Use the actual coverage printed on your selected paint can.
- Keep the 10% allowance for touch-ups and application loss.
- Prime new drywall, repairs, stains, or glossy surfaces when required.
- Mix multiple cans together ("boxing") before painting to ensure consistent colour.
What changes this estimate?
A one-foot increase in wall height adds 40 sq ft per coat. Adding the ceiling contributes 100 sq ft per coat. Use the calculator above for unusual openings, different coat counts, or a lower coverage rate for textured or porous surfaces.
Related room sizes
Compare all common room-size paint estimates →
Estimates are for planning; product instructions and field measurements take priority.