How to measure
Add up the width of all the walls and measure the height. We subtract 21 sq ft per door and 15 sq ft per window and add 10% extra. One gallon usually covers 350 to 400 sq ft per coat.
Example
A room with 48 ft of walls, 8 ft high, one door and one window has 348 sq ft to paint. Two coats need about 2.2 gallons, so buy 3 one-gallon cans.
Frequently asked questions
Do I need primer?
Yes on new drywall, patched areas or big color changes.
See also
Results are estimates for information only and are not financial, legal or medical advice. Rates, taxes and fees vary — confirm with a professional or your lender.