The base estimate is 16 litres before adding contingency.
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Use the area you plan to paint and the coverage printed on the product label.
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Paint Required in Litres = Surface Area Γ Number of Coats Γ· Coverage per Litre
View assumptionsFormula reviewCalcs at Hand Editorial TeamVerified 28 August 2026 Β· automated checks included
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Three useful checks, kept deliberately short.
Paint 80 mΒ² with two coats using paint rated for 10 mΒ² per litre: Multiply the surface by two coats Β· Divide by the label coverage Β· Round purchase quantities up to available can sizes.
Measure doors and windows separately if you plan to subtract them from the wall area.
Formula and assumptions
Paint Required in Litres = Surface Area Γ Number of Coats Γ· Coverage per LitreCoverage varies with surface texture, colour change, application method and paint type.
Keep in mind: Use the manufacturer's coverage guidance and add a practical contingency before purchase.
Produced byCalcs at Hand Editorial Team
Last formula check28 August 2026
Review methodKnown examples + boundary cases
Editorial and correction policy β