Paint Needed Calculator
Work out how many litres or gallons of paint you need for a room, including coats and coverage — free online. — free, fast and private.
Your result will appear here.
How to use Paint Needed Calculator
- Enter the total wall area in square feet.
- Enter the number of coats and the coverage per gallon (350 is typical).
- Click Calculate Paint to see how much paint to buy.
Note: this tool runs in your browser. Nothing is uploaded.
Frequently Asked Questions
How do I measure wall area for paint?
Measure each wall's width and height in feet and multiply them, then add the walls together. Subtract large windows and doors if you want a tighter estimate — or keep them in as your safety margin.
Is this tool free to use?
Yes, it is 100% free with no sign-up. Your data stays in your browser.
Is my data uploaded or stored?
No. This tool runs entirely in your browser — nothing you enter is uploaded to a server.
Can I use it on my phone?
Yes, it is fully mobile-friendly and works in any modern browser on phone, tablet or computer.