Paint Calculator
Estimate gallons of wall paint from wall length, height, openings, coats and product coverage.
Why use this paint calculator?
Paint Calculator converts net wall area and number of coats into gallons using the product's stated coverage.
Example
Subtract windows and doors, select two coats and enter the paint manufacturer's square-feet-per-gallon value.
Important note
Texture, porosity, primer, application method and color changes can alter real coverage.
How to use it
Start with the inputs shown above, review the assumptions or options, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
Is Paint Calculator free?
Yes. The core tool is free to use without creating an account.
Do I need an account to use Paint Calculator?
No. You can use the core Toolbox workflow without signing up.
Does Paint Calculator work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers, although complex file workflows can be easier on a larger screen.