Flooring & Tiling calculator
Carpet Calculator
Estimate carpet area and indicative roll length from room dimensions, fixed carpet roll width and a cutting allowance.
Estimate carpet area and indicative roll length from room dimensions, fixed carpet roll width and a cutting allowance. This estimate is most useful when the inputs reflect the job as it will actually be built, fitted or coated. Give particular attention to roll width, seam direction and room shape. Area alone does not always equal carpet ordered because carpet is sold in fixed roll widths. Check seam direction and the fitter's cutting plan before buying.
What you need to enter
The Carpet Calculator uses the following project information to calculate the result.
- Room length
- Room width
- Carpet roll width
- Cutting allowance (%)
Calculator result
Carpet area and indicative roll length
How the Carpet Calculator works
To produce carpet area and indicative roll length, the Carpet Calculator applies evaluates strip count from fixed roll width in both room orientations, estimates required roll length/area, then applies allowance. The engine is configured for carpet quantity for a room before allowing for joins, widths and fitting, not as a generic text estimate. Check roll width, seam direction and room shape, since an incorrect value there can materially change the result.
Carpet Calculator worked example
Carpet Calculator example: A 4.2 m × 3.4 m room has a floor area of 14.28 m². With carpet supplied on a 4.0 m roll, orienting the roll across the 3.4 m room can allow one 4.2 m cut (plus the chosen cutting allowance), whereas the opposite orientation may require multiple widths. The calculator compares the practical roll layout rather than treating floor area alone as the purchase quantity. The worked figure becomes more useful when roll width, seam direction and room shape is taken from the real product or site rather than a generic default.
Important calculation assumptions
For carpet quantity for a room before allowing for joins, widths and fitting, area alone does not always equal carpet ordered because carpet is sold in fixed roll widths. Check seam direction and the fitter's cutting plan before buying.
Frequently asked questions
What dimensions or project figures does the Carpet Calculator need?
Measure room length and width and enter the actual carpet roll width offered by the supplier. The layout should consider which orientation minimises strips, joins and waste. The Carpet Calculator then applies those figures to carpet quantity for a room before allowing for joins, widths and fitting.
What should I verify about roll width, seam direction and room shape before trusting the Carpet Calculator?
The key uncertainty in the Carpet Calculator concerns roll width, seam direction and room shape. Area alone does not always equal carpet ordered because carpet is sold in fixed roll widths. Check seam direction and the fitter's cutting plan before buying.
How should I turn the Carpet Calculator result into an order quantity?
For the Carpet Calculator, after calculating, use the result as a planning estimate and verify it against the product, supplier or design information for the actual project.