How is paint coverage calculated?

The calculator uses a typical coverage of about 350 sq ft per gallon (≈10 m² per litre), multiplied by your number of coats, then subtracts openings.

Does it include primer?

This estimates topcoat paint. For bare or dark walls, budget a separate coat of primer using the same area.

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Paint Calculator

Estimate how much paint you need.

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How to use the Paint Calculator

1Enter the wall dimensions or total area to paint.
2Set the number of coats and subtract doors/windows.
3See how many gallons or litres of paint to buy.

About the Paint Calculator

Free paint calculator — find out how many gallons or litres of paint you need for a room or wall based on its area, number of coats and door/window openings. Fast, accurate estimates.

Part of our Calculators collection. Browse all tools.

Frequently asked questions

How is paint coverage calculated?: The calculator uses a typical coverage of about 350 sq ft per gallon (≈10 m² per litre), multiplied by your number of coats, then subtracts openings.
Does it include primer?: This estimates topcoat paint. For bare or dark walls, budget a separate coat of primer using the same area.