▣ CALCULATORS Updated July 25, 2026

Paint Calculator

Measure once, buy the right number of tins.

Room length (m)
Room width (m)
Wall height (m)
Doors & windows to subtract (m2)
Coats
Paint coverage (m2 per litre)
Result
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How it works

Wall area is the room perimeter multiplied by the wall height, minus door and window openings; that area is multiplied by the number of coats and divided by the paint's stated coverage per litre.

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Frequently asked questions

What coverage should I use?

Most emulsions cover 10-12 m2 per litre per coat; the tin states the exact figure.

Do I need two coats?

Two coats are standard over an existing similar colour; expect three when covering a dark shade with a light one.

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