Estimate how much paint you need for a room. Enter wall dimensions, number of coats and the paint's coverage to get the paintable area, litres required and number of tins.
Enter the total wall length and height, the number of coats, the paint's coverage (m² per litre) and how many doors and windows to subtract. The calculator returns the paintable area, litres of paint and tins to buy.
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A paint calculator prevents over- or under-buying. Coverage depends on the paint and surface, so use the figure on the tin and round up — it's better to have a little left for touch-ups than to run out mid-wall.
Manufacturer labels state typical coverage (often 10–12 m²/L per coat). Use the lower end for porous, textured or previously unpainted surfaces.
Add the ceiling as a separate area (length × width) to your wall length total, or run the calculator twice. This tool covers walls only.