How much paint for a 14×18 room with 8' ceilings?
Answer
3 gallons (2 coats)
Total wall area: 512 sq ftPaintable area (after openings): 435 sq ftCoverage needed (2 coats): 870 sq ft
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How We Calculated This
Gallons = (Paintable Wall Area × Coats) / 350 sq ft per gallon
Walls: 2 × (18 + 14) × 8 = 512 sq ft. After 15% openings: 435 sq ft. × 2 coats = 870 sq ft ÷ 350 = 3 gallons
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Calculated using verified formulas. Last updated March 2026.