Home improvement
Paint Calculator
Estimate paint for the walls and optional ceiling of a rectangular room. Nothing you enter leaves your browser.
Enter your values, then calculate.
Calculation method
A transparent estimate.
Every adjustable assumption stays visible in the calculator, and discrete materials are rounded up only when it is time to buy.
(wall area − openings + optional ceiling) × coats ÷ label coverageWhat this estimate assumes
- Wall area is 2 × (length + width) × height.
- The 350 ft²/gal default is conservative within the typical 350–400 ft²/gal range.
- Only subtract large openings you measured; texture and application method can change real coverage.
Research sources
Simple by design
Get the answer, without the clutter.
FormatCalc is built for quick work. This paint calculator runs entirely on your device, so private text and data stay private.
Enter or paste your information.
02Set the values that matter to you.
03Copy, use, or download your result.
Common questions
Using the Paint Calculator
Is the Paint Calculator free to use?
Yes. FormatCalc's Paint Calculator is free to use with no account required.
Is my data private when I use the Paint Calculator?
Yes. This tool processes your input locally in your browser. FormatCalc does not upload or store what you enter.
How do I use the Paint Calculator?
Enter your values, select any units, and choose Estimate paint. You can then copy the result.
How is the Paint Calculator calculated?
It uses (wall area − openings + optional ceiling) × coats ÷ label coverage. The result is a planning estimate, so confirm the coverage or yield printed on your selected product.