A 10 × 10 room needs about 2 gallons
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 1.69 gallons. We recommend buying 2 gallons — see the calculator result panel for the optimal container combination.
A realistic 10 × 10 project
In a 10 × 10 nursery, four 8-foot walls create 320 sq ft before openings. One 21 sq ft door and two 15 sq ft windows reduce that to 269 sq ft. Two coats plus 10% extra require 1.69 gallons, so two one-gallon cans are the practical purchase.
What is distinctive about this size?
A compact square room has little staging space. Move the bed or desk to the center, finish two adjoining walls, then rotate the protected furniture rather than carrying it through a wet doorway.
The two-gallon purchase leaves roughly 0.31 gallon under these assumptions. Keep a tightly sealed, labeled jar for nursery scuffs and store the balance only where it will not freeze.
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 | 2 |
| Calculated paint | 1.69 gal |
Tips for a 10 × 10 room
For a compact bedroom, office, or nursery:
- 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.