Home measurement calculator
Paint Calculator
Estimate gallons of paint from wall width, wall height, openings, coats, and coverage per gallon. This page helps homeowners compare paint quantities before shopping.
Frequently asked questions
How much does one gallon of paint cover?
Many interior paints cover about 300 to 400 square feet per gallon, but product labels should be checked before purchase.
Should primer count as a coat?
Primer is usually planned separately unless the product specifically combines primer and paint.
Why round to a quarter gallon?
Quarter-gallon rounding gives a practical estimate while still showing when the job is far below a full gallon.