Calculators
Exterior Paint Calculator
Exterior siding needs more product per square foot. Preset uses lightly textured surface and primer.
Example footprint is 40 by 30 ft with 9 ft wall height.
| Surface | Room | Area | Coats | Coverage | Buy |
|---|---|---|---|---|---|
| Walls | Exterior walls | 1225 sq ft | 2 | 297.5 | 8 gallons + 1 quart (or 2× 5-gal buckets) |
| Primer | Exterior walls | 1225 sq ft | 1 | 255 | 5 gallons (or 1× 5-gal bucket) |
Assumptions
- Surface type: Lightly textured (×0.85)
- 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 — 3 rolls
- 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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