Home & travel tools
Paint Calculator
Estimate gallons of wall paint needed from room dimensions and coverage.
Estimate how much wall paint a rectangular room may require. You can set the number of coats and the coverage listed on your paint can.
What this estimate covers
The calculation uses all four walls of a rectangular room. It does not automatically subtract doors or windows, which gives a small buffer for many projects.
Coverage varies
Paint type, color change, surface texture, primer, application method, and wall condition can affect actual coverage. Check the manufacturer's label.
Round up for purchase sizes
Paint is sold in fixed container sizes. If the estimate is slightly above a gallon, compare the cost of additional quarts versus another gallon and keep touch-up needs in mind.
Frequently asked questions
Does this include the ceiling?No. This version estimates walls only.
Should I count two coats?Use the number recommended for your paint and project. Two coats are common but not universal.