Paint Calculator
Calculate gallons of paint needed for walls and ceilings
Paint Calculator
Calculate paint needed for your room or project. Get gallon requirements, primer needs, and cost estimates for interior and exterior painting.
Room Dimensions
Length of the room
Width of the room
Typical: 8ft for standard ceilings, 9-10ft for high ceilings
Openings
Standard door is 21 sq ft
Average window is 15 sq ft
Paint Details
1 coat for touch-ups, 2 coats standard, 3 for dark colors
Needed for new drywall, color changes, or stain blocking
Paint Coverage Guide
One gallon of paint typically covers 350-400 square feet with one coat. Coverage varies based on surface texture, porosity, and application method. Rough or porous surfaces require more paint than smooth surfaces.
Two coats are standard for most projects. Use three coats when covering dark colors with light paint, or painting over bold patterns. Always use primer on new drywall, bare wood, or when making dramatic color changes.
Frequently Asked Questions
Everything you need to know about this tool