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Curtain Fabric Needed Calculator

Work out curtain fabric needed instantly with clear inputs, formula shown and shareable results.

About Curtain Fabric Needed Calculator

Curtain fabric is calculated from gathered width, not window width: multiply the track by the fullness ratio, divide by the roll width and round up to whole widths. Each cut length is the finished drop plus about 30 cm for hem and heading.

Formula

Curtain fabric

gathered width = track x fullness; widths = ceil(gathered / roll width); length = widths x (drop + allowance)

Worked example

With the default values below, Curtain Fabric Needed Calculator returns Fabric length required of 10.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Track or pole width
240 cm
Finished drop
220 cm
Fullness ratio
2.2 x
Fabric roll width
137 cm

Results

Fabric length required
10.00 m
Fabric widths needed
4 widths
Total gathered width
528.00 cm
Hem and heading allowance
30.00 cm

Step by step

  1. 1Values used
  2. 2Curtain fabric
  3. 3Fabric length required= 10.00 m
  4. 4Fabric widths needed= 4 widths
  5. 5Total gathered width= 528.00 cm
  6. 6Hem and heading allowance= 30.00 cm

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

What fullness should I use?

2 to 2.5 times for pencil pleat, 2.5 for pinch pleat, and as little as 1.5 for eyelet headings on a plain fabric.

What about pattern repeats?

Each cut must start at the same point in the pattern, so add one repeat length per width. On a large repeat this adds substantially to the total.

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