Calculate exactly how many gallons of paint you need for your room or project. Get instant estimates for paint costs and labor.
Total Wall Area
396 sq ft
346 sq ft paintable (minus doors/windows)
Paint Needed
2 gallons
Based on 350 sq ft coverage per gallon × 2 coats
Estimated Paint Cost
$60 – $100
$30-$50 per gallon range
Estimated Labor Cost
$692 – $1,038
$2-$3 per sq ft professional rate
Total Project Estimate
$752 – $1,138
Paint + Labor (DIY saves on labor costs!)
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Common questions about paint coverage and estimating
For a standard 12x12 room with 9-foot ceilings, you'll need approximately 2-3 gallons for two coats. This accounts for about 400 sq ft of wall space after subtracting doors and windows. Our calculator above gives you an exact estimate based on your specific room dimensions.
One gallon of paint typically covers 350-400 square feet per coat on smooth surfaces. Rough or textured surfaces may require more paint. Our calculator uses 350 sq ft as a conservative estimate to ensure you have enough paint for your project.
Two coats is recommended for most painting projects, especially when changing colors or painting over darker shades. One coat may suffice for touch-ups or when painting the same color. Always apply primer first on new drywall or when making dramatic color changes.
Interior paint is formulated for indoor conditions with lower VOCs and better washability. Exterior paint contains additives that resist fading, mildew, and weather damage. Never use interior paint outdoors—it won't hold up to the elements.