How to Calculate Paint Coverage
Calculating the right amount of paint for your project prevents costly overbuying and frustrating mid-project store runs. One gallon of paint typically covers 350-400 square feet of smooth surface in one coat. However, several factors affect actual coverage.
Paint Coverage by Surface Type
| Surface Type | Coverage per Gallon | Notes |
|---|---|---|
| Smooth Drywall | 350-400 sq ft | Best coverage rate |
| Textured Drywall | 300-350 sq ft | Knockdown, orange peel |
| Rough/Stucco | 200-250 sq ft | Porous surfaces absorb more |
| Brick/Masonry | 150-200 sq ft | Very porous, multiple coats needed |
| Wood (bare) | 300-350 sq ft | Prime first for best results |
How Many Coats Do You Need?
- 1 Coat: Touch-ups or same-color repainting with quality paint
- 2 Coats: Standard for most color changes, provides uniform finish
- 3+ Coats: Dark-to-light transitions, reds/yellows over different colors
Standard Deductions
When calculating paintable area, subtract openings:
- Standard Door: 21 sq ft (3' x 7')
- Standard Window: 15 sq ft (3' x 5' average)
- Sliding Glass Door: 42 sq ft (6' x 7')
- Fireplace: 20-30 sq ft (varies)
Tips for Accurate Paint Estimates
- Always add 10% extra for waste, touch-ups, and mistakes
- Buy an extra quart for future touch-ups
- Dark colors typically require additional coats
- New drywall may absorb more paint than expected
- Primer reduces the number of topcoats needed
- Calculate trim and ceiling paint separately
Paint Types and Their Uses
| Finish | Best For | Durability |
|---|---|---|
| Flat/Matte | Ceilings, low-traffic areas | Low |
| Eggshell | Living rooms, bedrooms | Medium |
| Satin | Kitchens, bathrooms, kids rooms | Medium-High |
| Semi-Gloss | Trim, doors, high-moisture areas | High |
| Gloss | Cabinets, furniture, accent trim | Very High |