Paint Calculator
How many gallons to cover your walls — including coats.
Enter your total wall area and number of coats to find out how many gallons of paint to buy, using standard coverage of ~350 sq ft per gallon.
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How much paint do I need?
One gallon covers about 350 sq ft per coat on smooth, previously painted walls. Measure each wall (length × height), add them up, multiply by coats, then divide by 350.
FAQ
Do I subtract doors and windows?
For a quick estimate you can ignore them; for a tighter number subtract about 20 sq ft per door and 15 sq ft per window.