Calculate exactly how much paint you need for your project. No waste, no guesswork.
Ready to calculate
Enter your room dimensions
350-400
sq ft/gal • Interior walls
400-450
sq ft/gal • Trim & doors
300-350
sq ft/gal • New surfaces
Why expert review matters
Every calculator is reviewed by certified professionals to ensure accuracy.Hawkin's CCP, CEP certification ensures professional-grade precision.
Paint for a 12x12 room?
2-3 gallons for two coats
One coat or two?
Two coats recommended
When need primer?
New drywall or color changes
Our paint calculator uses industry-standard coverage rates to determine exactly how much paint you'll need. The calculation accounts for your room's total wall area, subtracts openings like doors and windows, and factors in your desired number of coats.
Formula
(Wall Height × Perimeter - Doors × 20 - Windows × 15) × Coats ÷ 375 = Gallons