Paint Calculator
Estimate gallons of wall paint from wall length, height, openings, coats and product coverage.
✓ No signup✓ Mobile friendly✓ Clear limitations✓ Browser-first where practical
Recent tools are remembered only on this device.
Planning estimate. Verify final quantities, local codes, manufacturer instructions and site conditions before purchasing materials or carrying out work.
5.28 galPaint required
6Whole gallons to buy
840 ft²Net wall area
1,680 ft²Coated area
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 any options or assumptions, 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 this tool free?
Yes. The core tool is free to use.
Do I need an account?
No. You can use it without signing up.
Does it work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers.