Wall Paint Calculator
Work out wall paint gallons and can combinations from room size
About Wall Paint Calculator
Wall Paint Calculator is a free, browser-based tool for homeowners and DIY painters who want to know how much paint a room needs before shopping. Enter room length, width and height, subtract doors and windows, then set the number of coats, the coverage printed on the label and a waste reserve.
The tool turns those inputs into a paintable wall area, a gallon requirement and a practical shopping list of standard can sizes. It also shows leftover paint and can compare optional can prices to estimate a material total. Calculations run locally and no account is needed.
Its main difference is transparency: each step of the formula is shown, so you can see which assumption changed the result. It also reminds users to check the coverage on their own product label, since paint coverage varies.
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