When to use this calculator
Estimate carpet spending using roll width, purchased length and fitting costs. Uses purchased roll dimensions, which may exceed the net floor area.
Explore the material quantities calculators for other questions in this topic. For a related calculation, use the Concrete Bag Calculator: Convert wet concrete demand into whole bags of a selected premix.
PUTTING IT INTO PRACTICE
Carpet Cost: 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 |
|---|---|
| Purchased carpet length (m) | 5 |
| Roll width (m) | 4 |
| Price per m² | 20 |
| Fitting and other costs | 100 |
| Result | 500 currency units |
- Check the input labels and enter the example values above.
- Apply the relationship: Total = roll length × roll width × price/m² + extras.
- The result is 500 currency units, rounded for display.
How to interpret your result
Uses purchased roll dimensions, which may exceed the net floor area.
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.
When is the carpet cost calculator useful?
Estimate carpet spending using roll width, purchased length and fitting costs. Uses purchased roll dimensions, which may exceed the net floor area.
How do I use the carpet cost calculator?
Enter purchased carpet length (m), roll width (m), price per m², fitting and other costs. The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
Total = roll length × roll width × price/m² + extras.
What should I check before using the result?
Uses purchased roll dimensions, which may exceed the net floor area.
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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