Paint Calculator
Calculate how many gallons of paint you need.
About this tool
Figure out how many gallons of paint to buy based on the total wall area, how many coats you're applying, and the coverage rate printed on your paint can (typically 350–400 sq ft per gallon).
Key Features
- Accounts for multiple coats
- Adjustable coverage rate per paint brand
- Rounds up to a practical gallon amount
How to Use
- Enter the total wall area to be painted.
- Enter the number of coats.
- Enter the coverage per gallon from your paint can label.
- Click Calculate Paint.
Benefits
- Avoid a mid-job trip back to the store
- Avoid buying more paint than you need
- Works for any room size or paint brand
Frequently Asked Questions
Multiply each wall's width by its height and add them together, then subtract large door and window areas if you want a more precise number — for a rough estimate, most people skip subtracting openings since it just adds a small safety margin.
It depends on the paint formula, the wall's texture and porosity, and the application method — check the specific number printed on your can rather than assuming a universal figure.