Calculate the complete cost of your painting project including paint, primer, and all necessary supplies.
Ready to calculate
Enter your room details
$28
per gallon
350 sq ft coverage
$40
per gallon
400 sq ft coverage
$55
per gallon
450 sq ft coverage
Why expert review matters
Every calculator is reviewed by certified professionals to ensure accuracy.Hawkin's CCP, CEP certification ensures professional-grade precision.
How much paint do I need per coat?
One gallon covers approximately 350-400 sq ft depending on quality.
Do I really need primer?
Yes for new drywall, dark colors, or significant color changes.
Is premium paint worth it?
Often yes - better coverage can mean fewer coats and longer lasting finish.
Our paint cost calculator estimates your total project cost by calculating the paintable area (wall height × perimeter minus doors and windows), then determining gallons needed based on coverage and number of coats. We add primer and supplies costs based on your selections.
Formula
Paintable Area = (Height × Perimeter) - Doors - Windows
Gallons = (Area × Coats) ÷ Coverage per gallon