Calculators
Interior Paint Calculator
Interior rooms share the same math: perimeter times ceiling height, minus openings, times coats, divided by coverage.
Controls below let you add up to six rooms. Project totals sum areas first, then round up once.
| Surface | Room | Area | Coats | Coverage | Buy |
|---|---|---|---|---|---|
| Walls | Living area | 445 sq ft | 2 | 350 | 2 gallons + 3 quarts |
Assumptions
- Surface type: Previously painted, smooth (×1)
- 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
- 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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