Calcometry
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Paint Calculator
Wall area from perimeter × height minus doors/windows, divided by coverage per gallon.
Room & paint
Paint needed
1.85 gal
324 sq ft net wall area
- Gross wall area
- 384 sq ft
- Net (minus openings)
- 324 sq ft
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Paint coverage
One US gallon typically covers ~350 sq ft per coat on smooth walls. Rough or porous surfaces need more.
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