One Gallon of Paint Coverage
One gallon of paint covers 350-400 sq ft on average. Learn what affects coverage and how to calculate paint needs.
Standing in the paint aisle holding a gallon can, the first question everyone asks is "how far will this actually go?" The can says 350–400 square feet. Real life says it depends — on your walls, your roller technique, and whether you bought the cheap stuff or the good stuff.
The Industry Standard: 350–400 Sq Ft Per Gallon
Manufacturers test on smooth, primed surfaces with professional sprayers. In an actual room with actual walls, figure 300–350 sq ft per gallon for interiors and 250–300 sq ft for exterior surfaces.
What Actually Affects Coverage
Surface Texture
This is the one people overlook. Smooth drywall drinks paint evenly. Textured walls — orange peel, knockdown, popcorn — have more actual surface area and trap paint in all the little crevices. Stucco and brick exteriors? They'll consume 2–3 times more paint than smooth siding. No way around it.
Paint Quality
Premium paint has more solids (pigment + binders) and less water. More solids = better hiding power. A $50 gallon might cover 400 sq ft. A $25 gallon might peter out at 250. The math favors spending more: fewer coats, less paint used, better-looking walls.
Color Change
Going white over navy blue? You'll burn through more paint than going beige over light tan. Drastic color changes demand more coats, which means your effective coverage per gallon drops.
Real-World Coverage at a Glance
| Room / Project | Coverage Needed | Gallons (2 coats) |
|---|---|---|
| Small bathroom (5×8) | ~180 sq ft walls | 1 gallon |
| Standard bedroom (12×12) | ~350 sq ft walls | 2 gallons |
| Master bedroom (15×15) | ~430 sq ft walls | 3 gallons |
| Large living room (20×15) | ~500 sq ft walls | 3 gallons |
| Open concept great room | ~800+ sq ft walls | 5 gallons |
Squeezing Every Drop Out of a Gallon
- Always prime bare drywall or big color changes — primer is cheaper than an extra coat of paint.
- Use the right roller nap: 3/8" for smooth walls, 1/2" for textured. Wrong nap = wasted paint.
- Don't over-roll. Once the roller starts dragging, reload it. A dry roller leaves lap marks you'll need more paint to fix.
- Maintain a wet edge. Letting edges dry creates stripes and forces touch-ups.
- Stir the paint. Solids settle at the bottom. Pouring from an unstirred can gives you thin, watery coverage.