How much paint for a 9×12 room with 10' ceilings?
Answer
3 gallons (2 coats)
Total wall area: 420 sq ftPaintable area (after openings): 357 sq ftCoverage needed (2 coats): 714 sq ft
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How We Calculated This
Gallons = (Paintable Wall Area × Coats) / 350 sq ft per gallon
Walls: 2 × (12 + 9) × 10 = 420 sq ft. After 15% openings: 357 sq ft. × 2 coats = 714 sq ft ÷ 350 = 3 gallons
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Calculated using verified formulas. Last updated March 2026.