Calculators

Paint Estimator

How much paint your walls need.

UnitsNumber of coats

Room length (m)Room width (m)Wall height (m)

DoorsWindowsCoverage per litre (m²)

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Total wall area

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Paintable area

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Paint needed

This free paint estimator works out how much paint your walls need. Enter the room length, width and wall height, then subtract doors and windows to get the paintable area. Multiply by the number of coats and divide by your paint's coverage rate to see the total litres or gallons required. A standard door is treated as roughly 1.8 m² and a window as 1.5 m² (scaled for imperial units). Everything is calculated in your browser.