Find exactly how many gallons of paint you need for any room, with deductions for doors and windows and support for multiple coats.
How it works
- Enter the dimensions of your room (length, width, ceiling height).
- Input the number of doors and windows to accurately deduct area.
- Set the required number of coats to see your exact gallon requirement.
Frequently asked questions
Why does my coverage differ from the label?
Label coverage assumes a smooth primed surface. Rough or unpainted walls absorb more — use 300 sq ft/gal as a conservative estimate.
Do I need primer?
For new drywall, very dark colors, or covering stains, yes. Primer is calculated separately and usually needs one coat.
How much extra should I buy?
Pick up one extra quart for touch-ups. Seal the lid tightly and store indoors — it lasts years.