How it works
Enter paintable surface area after deducting any doors or windows. Coverage varies by surface texture and the product you buy.
FormulaLitres = area × coats × (1 + waste%) ÷ coverage per litre.
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Estimate litres of paint required after accounting for coats, coverage and waste.
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YOUR RESULT
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Paint needed: a worked example
With paintable area (m²) 42, number of coats 2, coverage (m² per litre) 10, extra for waste (%) 10, the litres of paint required is 9.24 L.
| Paintable area (m²) | 42 |
|---|---|
| Number of coats | 2 |
| Coverage (m² per litre) | 10 |
| Extra for waste (%) | 10 |
| Litres of paint required | 9.24 L |
|---|---|
| Coverage without waste | 8.4 L |
| Area across all coats | 84 m² |
Amounts are shown in US dollars for illustration. Choose your own currency in the calculator above; it labels amounts and does not convert them.
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Modelled results are estimates. Independently check decisions involving health, finances or safety.
Frequently asked questions
How is the paint needed calculated?
Litres = area × coats × (1 + waste%) ÷ coverage per litre. Enter paintable surface area after deducting any doors or windows. Coverage varies by surface texture and the product you buy.
What does the paint needed example show?
With paintable area (m²) 42, number of coats 2, coverage (m² per litre) 10, extra for waste (%) 10, the litres of paint required is 9.24 L. Coverage without waste: 8.4 L; Area across all coats: 84 m².
What assumptions and limits apply?
This is an estimate based on the inputs and assumptions shown on this page, not professional advice. Check anything with financial, health or safety consequences independently.
Is my data private?
Yes. Calculations run in your browser and your numbers are not sent to a server. A share link contains the inputs you choose to share, so check it before sending it to anyone.