Paint Calculator

Find out how many gallons of paint you need for a room.

How the paint estimate works

• Wall area is the room's perimeter times the ceiling height.
• Doors and windows are subtracted using standard sizes.
• The ceiling, if included, is added as length times width.
• Total area is multiplied by the number of coats, then divided by the coverage per gallon.
• The result is rounded up to whole gallons.

Tips before you buy

Dark colors, new drywall, and rough textures soak up more paint, so use a lower coverage number such as 250 to 300 sq ft per gallon. If you land just above a whole gallon, buying one extra for touch-ups is usually worth it.