Calculate how much paint you need for walls. Free paint calculator.
This paint coverage tool lets you estimate how many gallons of paint you need based on room dimensions and number of coats. It is designed for speed and accuracy, running entirely in your browser with no data sent to any server. Whether you are a student, professional, or simply need a quick answer, this calculator provides instant results with clear explanations. Enter wall height and the total perimeter of the room. The calculator subtracts standard window and door areas from the total wall area, applies the coverage rate (typically 350-400 sq ft per gallon), and multiplies by the number of coats.
Enter wall height and the total perimeter of the room. The calculator subtracts standard window and door areas from the total wall area, applies the coverage rate (typically 350-400 sq ft per gallon), and multiplies by the number of coats.
Homeowners estimate how many cans of paint to buy for interior rooms. Painters prepare accurate quotes for residential and commercial projects. Landlords budget for apartment turnover painting costs. DIY enthusiasts plan accent wall projects with the right amount of paint. Property managers estimate painting costs across multiple units.
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Yes, this Paint Coverage calculator is completely free with no signup, no account creation, and no usage limits. All calculations run locally in your browser, so your data stays private and results appear instantly.
This calculator uses standard mathematical formulas and internationally recognized conversion factors. Results are displayed with up to six significant digits of precision. For most everyday uses, the results are more than accurate enough.
Yes, the calculator is fully responsive and works on smartphones, tablets, and desktop computers. The interface automatically adjusts to your screen size. Touch inputs and on-screen keyboards work seamlessly.
Once the page has loaded in your browser, the calculator works without an internet connection. All computation happens locally using JavaScript. Bookmark the page for quick access anytime.
This calculator uses standard, well-established formulas that are widely accepted in education, science, and professional practice. The specific formula is explained in the "How it works" section above.