Planning notes
Paint Calculator questions
How many square feet does a gallon of paint cover?
Most interior paint covers about 300 to 400 square feet per gallon per coat. Check the can label and lower the coverage number for rough or dark surfaces.
Should I buy extra paint?
A 10 percent buffer is usually enough for touch-ups, roller loss, and small measuring mistakes.
Does this include primer?
The main gallons are for paint. Add primer if you are covering stains, bare drywall, or a major color change.
Before you buy
Use this estimate as a planning starting point. Product coverage, waste, local prices, code rules, and site conditions can change the final amount.