Room Paint Calculator Room Paint Calculator Quickly estimate how much paint you’ll need (walls only). ApartmentPride tool Room length m Length in meters. Room width m Width in meters. Wall height m Height from floor to ceiling. Number of coats 1 coat 2 coats (typical) 3 coats More coats = more paint (primer counts). Doors (total area) m² Total area of doors to subtract (meters squared). Windows (total area) m² Total area of windows to subtract (meters squared). Paint coverage m² per litre Typical: 8–12 m²/l. Default=10 m²/l. Wastage allowance 5% (small) 10% (recommended) 15% (complex surfaces) Covers mistakes, touch-ups, and surface absorption. Calculate Reset Outputs: litres · gallons · cans Estimation Total paintable wall area: — m² Paint required: — litres Equivalent: — US gallons Suggested purchase: — Quick tips: Always round up — better to have a little extra for touch-ups. Primer may reduce coats needed; if primed, choose 1–2 coats. Textured walls use more paint — choose 15% wastage for them.
