How do I measure paintable area?

Multiply each wall length by its height, add ceilings, and subtract large openings. Quick rule: room floor area × 3 approximates walls plus ceiling.

One coat rarely hides the old color evenly. Two coats give uniform finish and durability; going over a dark color may need three.

Does surface texture matter?

Yes - rough plaster and unpainted putty absorb more paint, reducing effective coverage by up to 20%. Primer helps on new surfaces.

Paint Calculator - Liters for Walls & Ceilings

Work out paint and primer liters from area, coats and coverage in seconds.

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Stop Guessing at the Paint Store

A liter of emulsion covers roughly 10 m² per coat, but rooms, coats and surfaces differ. AiLoveKit's paint calculator turns your measured area, coat count and can coverage into exact liters for finish paint and primer - so you buy enough without carting home surplus tins.

Estimating Wall Area Fast

Room rule of thumb - floor area × 3 for walls plus ceiling.
Deduct openings - subtract doors and large windows.
New plaster - always budget a primer coat.

Repainting after fresh plaster? Start with the Plaster Calculator.