Does this account for windows and doors?

No, enter the net wall area (gross wall area minus windows and doors) for the most accurate estimate. Leaving them in gives you a small safety margin.

Why does the calculator assume 120 sqft of coverage per litre?

That's a typical figure for emulsion paint on a smooth interior wall. Coverage varies by brand, paint type (primer vs. topcoat), and surface texture, check your paint tin's stated coverage for a more precise number.

Paint Quantity Calculator

Estimate how much paint you need for a wall area.

How this is calculated

Litres = Area × Coats ÷ Coverage per litre (≈120 sqft)

Assumptions used in this calculation

Coverage: Assumes 1 litre covers ~120 sqft per coat, actual coverage varies by paint brand and surface.

About this calculator

The paint quantity calculator estimates litres of paint needed from wall area and number of coats, using a standard coverage assumption.

Worked example

500 sqft, 2 coats

Result: ≈ 8.4 litres

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Frequently asked questions

Does this account for windows and doors?

Why does the calculator assume 120 sqft of coverage per litre?

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