Calchy.
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Quick reference

Most interior wall paint covers ~10 m² per litre per coat. Two coats are standard for proper opacity and durability — so a 20 m² room needs about 4 L total. Round up to the next can size; leftover paint is better than running short mid-job.

Formula
litres needed = (m² × coats) ÷ coverage_per_litre

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