> For the complete documentation index, see [llms.txt](https://help.prequilt.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.prequilt.com/prequilt-101/fabric-calculator/calculations-explained/backing-fabric.md).

# Backing Fabric

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Dimensions for the quilt back are based on the overall dimensions of your quilt from the PreQuilt application.
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<figure><img src="/files/78zFhzfgQJcbHmC2QfnN" alt=""><figcaption><p>Horizontal Seam Option for Quilt Back</p></figcaption></figure>

## <mark style="color:blue;">Quilt Backing</mark>

On the **Backing tab**, you can input some preferences for your quilt back and PreQuilt will offer you two calculations - backing with a horizontal seam and backing with a vertical seam.

You can input the following variables:

* Backing width of fabric (WOF)
* Overage