Accurately gauging paint coverage per gallon is key to ordering the right amount of paint, avoiding waste, and sticking to your budget. Coverage depends on paint quality, surface texture, and the number of coats you apply.
Manufacturer Coverage Ratings
Most brands like Benjamin Moore and Sherwin-Williams rate interior paints at 350–400 sq ft per gallon on smooth drywall. Specialty coatings and exterior formulas often cover less.
Key Factors Affecting Coverage
- Surface Texture: Rough or porous walls absorb more paint, reducing effective coverage.
- Coat Count: More coats multiply the amount needed.
- Paint Quality: Premium products deliver higher pigment load and better hide.
- Application Method: Sprayers, rollers, and brushes distribute paint differently.
- Color Transitions: Dramatic shifts often require additional passes for full opacity.
Coverage by Surface Type
| Surface Type | Coverage (sq ft/gal) |
|---|---|
| Smooth Interior Drywall | 350–400 |
| Lightly Textured Walls | 300–350 |
| Wood Trim & Doors | 300–325 |
| Rough Masonry or Brick | 200–250 |
How to Calculate Your Paint Needs
Use this formula with your brand’s advertised coverage:
Total Gallons = (Total Surface Area ÷ Coverage per Gallon) × Coats
Example Calculation
For a 12×12 room with 8′ ceilings (384 sq ft of wall area) and two coats on smooth drywall:
- Total Area: 384 sq ft
- Coverage Rate: 375 sq ft/gal
- Required Paint: (384 ÷ 375) × 2 ≈ 2.05 → round up to 3 gallons
Pro Tips to Maximize Coverage
- Apply thin, consistent coats instead of thick ones.
- Prime porous or patched areas to reduce absorption.
- Use quality rollers and brushes to minimize paint loss.
- Keep a wet edge to avoid overworking and leaving marks.
FAQs on Coverage Planning
Do tinted paints cover differently? Yes—deep colors may need extra passes due to lower opacity. How do I calculate for ceilings? Ceiling paints generally cover around 350 sq ft/gal; calculate separately. Can I reuse leftover paint? Properly sealed cans can be stored for touch-ups; keep in a cool, dry place.
Plan Your Project with Confidence
Use our printable coverage chart and Paint Calculator to order the perfect amount of paint.
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