When to use this calculator
Estimate litres of paint for a net area and number of coats. Subtract openings and use the manufacturer’s coverage for your surface and paint.
Explore the material quantities calculators for other questions in this topic. For a related calculation, use the Paver Quantity Calculator: Estimate rectangular pavers for an area using paver dimensions plus joint width.
PUTTING IT INTO PRACTICE
Paint Quantity: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Net area (m²) | 50 |
| Number of coats (integer) | 2 |
| Coverage (m²/litre) | 10 |
| Result | 10 litres |
- Check the input labels and enter the example values above.
- Apply the relationship: Litres = net area × coats ÷ coverage.
- The result is 10 litres, rounded for display.
How to interpret your result
Subtract openings and use the manufacturer’s coverage for your surface and paint.
Calculate net geometric quantities first, then apply a project-specific allowance where appropriate. Coverage per bag or pack should come from the product label. Bulk density, trimming and compaction can substantially change order quantities.
Frequently asked questions
Does a geometric estimate include waste automatically?
Only when a waste or allowance input is provided. Otherwise add an appropriate allowance separately before ordering.
How do I use the paint quantity calculator?
Enter net area (m²), number of coats (integer), coverage (m²/litre). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Litres = net area × coats ÷ coverage.
What should I check before using the result?
Subtract openings and use the manufacturer’s coverage for your surface and paint.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
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