Quilt Backing Calculator — Backing Fabric Yardage
Work out how much backing fabric you need with seaming for wide quilts.
8-10cm typical for quilting
Standard quilting cotton: 112cm
How We Calculate This
Backing dimensions are calculated by adding overhang allowance to each side of the quilt for quilting grip.
The formula
Backing width = Quilt width + (Overhang × 2)
Backing length = Quilt length + (Overhang × 2)
Panels = ceil(Backing width ÷ Fabric width)
Total fabric = Panels × Backing length
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before cutting or purchasing fabric.