Spray Paint Calculator
Calculate how many spray paint cans you need for your project.
Enter coverage area and surface type to get an accurate estimate.
Spray Paint Cans Needed
Spray paint coverage depends on can size, surface texture, and number of coats.
Cans Needed = (Surface Area × Coats) / Coverage per Can
Standard spray paint coverage:
| Can Size | Coverage per Can |
|---|---|
| 12 oz (340 g) | ~20 sq ft (~1.9 m²) |
| 16 oz (454 g) | ~25 sq ft (~2.3 m²) |
Surface adjustments:
- Smooth surfaces (metal, glass): full coverage rate
- Semi-rough (wood, primed): reduce coverage by ~20%
- Rough/porous (brick, concrete): reduce coverage by ~40%
Tips:
- Always apply thin, even coats — 2–3 light coats beat 1 heavy coat
- Shake the can for at least 1 minute before spraying
- Spray at 10–12 inches (25–30 cm) from the surface