Calculators
Primer Calculator — How Much Primer to Buy
Primer has its own coverage figure. Example is 12 by 12 ft with bare drywall.
Toggle topcoat surfaces in the controls below if needed.
| Surface | Room | Area | Coats | Coverage | Buy |
|---|---|---|---|---|---|
| Walls | Room | 349 sq ft | 2 | 280 | 2 gallons + 2 quarts |
| Ceiling | Room | 144 sq ft | 2 | 280 | 1 gallon + 1 quart |
| Primer | Room | 493 sq ft | 1 | 240 | 2 gallons + 1 quart |
Assumptions
- Surface type: New or bare drywall (×0.8)
- Wall/ceiling coverage: 350 sq ft/gal
- Primer coverage: 300 sq ft/gal
- Default door opening: 20 sq ft
- Default window opening: 15 sq ft
- Trim estimate width: 0.33 ft (rough)
Supplies checklist
- Primer — Per materials table
- Painter's tape — 1 roll
- Drop cloths
- Roller covers — 2–3
- Angled brush
- Roller tray liners
- Spackle / filler
- Sandpaper
Estimates only. Check the coverage figure on your product before buying.
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