Paint Calculator
Enter your wall dimensions, subtract any openings, and set the number of coats to see how much paint to buy.
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What this tool does
Enter your wall dimensions, subtract any openings, and set the number of coats to see how much paint to buy.
Formula
Net area = (width × height) - opening area. Total area = net area × number of coats. Paint needed = total area / coverage rate (m² per liter, from the paint can's label).
Frequently asked questions
Where do I find the coverage rate?
It is printed on the paint can - it varies by brand, paint type and surface texture, typically 8-12 m² per liter for interior walls.
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