Interior
Paint Calculator
Estimate paint by wall dimensions, coats, and coverage. Doors and windows are subtracted automatically.
Inputs
Live estimate
Gallons needed
2
- Gross wall area
- 384 sq ft
- Paintable area
- 333 sq ft
- Paint cost
- $90
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How it's calculated
Gross area = walls × wall length × wall height.
Paintable area = gross area − (doors × 21) − (windows × 15).
Gallons = ceil(paintable × coats ÷ coverage × (1 + waste %)).
Material assumptions
- Standard coverage: 350 sq ft per gallon per coat.
- Doors subtract 21 sq ft each; windows subtract 15 sq ft each.
- Add 5–10% for touch-ups on textured or new drywall.
Frequently asked questions
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Related calculators
These results are estimates only. Confirm quantities, compaction, waste, and delivery requirements with your supplier or project professional before ordering materials.