How it works
Backing size = quilt width/height + 2 × overage. Find the least n such that n × usable WOF − (n − 1) × total join take-up covers the target span.
— BACKING / FREE ONLINE TOOL
Quilt backing calculator: yardage and seams.
Compare two backing panel directions with real seam take-up. Find a valid run length and the actual fabric yardage to purchase.
✓ Feasible layouts✓ Live yardage✓ No sign-up
MADE FOR REAL FABRIC01 / 03
Plan it once.Cut it with confidence ✳
● YOUR CUTTING PLANLOCAL CALCULATION · V2
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DEFAULT EXAMPLE
60 × 80 in quilt + 4 in per side gives 68 × 88 in backing. At 43 in WOF and 1 in seam take-up, a vertical-seam plan uses 2 × 88 in → 5 yd; horizontal uses 3 × 68 in → 5¾ yd.
✳ Verifiable cut layout⊞ No cloud upload↔ Real fabric width✓ Print-friendly
— UNDER THE STITCHES
Clear math. Better cuts.
Understand the calculation before cutting into fabric.
From measurements to fabric
Measure usable WOF after excluding selvedges. Enter backing overage, total loss per joined seam, grain restriction and shop purchase increments. Each rectangular panel is placed on a fabric roll.
What it does not assume
One-way prints cannot be rotated. Panel trim after joining differs from roll offcuts. Diagonal backing is outside this calculator.
— THE WORKED EXAMPLE
Start with something familiar.
60 × 80 in quilt + 4 in per side gives 68 × 88 in backing. At 43 in WOF and 1 in seam take-up, a vertical-seam plan uses 2 × 88 in → 5 yd; horizontal uses 3 × 68 in → 5¾ yd.
— PRACTICAL MEASUREMENT GUIDE
How to calculate quilt backing fabric from your actual WOF
Backing yardage depends on finished quilt size, the allowance around it, usable bolt width, seam take-up and panel direction. An area-only estimate misses the number of panels that must be joined.
A reproducible 60 × 80 inch backing example
With 4 inches of overage on each side, the backing must cover 68 × 88 inches. At 43 inches of usable WOF and 1 inch of total take-up per joined seam, two vertical panels can make a joined width of 85 inches. Cut two 88-inch lengths: 176 inches of roll length, or about 4.89 yards raw, rounded to 5 yards in eighth-yard increments.
Turning the construction gives three panels, each 68 inches long: 204 inches total. That is 5⅔ yards raw, rounded to 5¾ yards. Select the shorter permitted plan; a one-way print may prohibit the alternative orientation.
What changes with 108-inch wide backing?
Extra-wide backing can sometimes cover the requested span with one unjoined piece. Set the measured usable width—not just the advertised bolt width—to 108 inches if that is truly available for cutting. For the 68 × 88 inch example, one panel can fit across 108 inches; check the chosen grain direction and required length.
The calculator reports panel count, assembly seam positions before trimming, cutting coordinates and roll offcut separately. Extra width does not eliminate the need for quilting overage or prewash allowance.
When these numbers are not a cutting instruction
The built-in model handles full-width rectangular panels and straight joins. It does not model diagonal backing, pieced motifs, selvage-specific pattern matching, fabric defects, or mechanical longarm requirements. Confirm any special method before cutting.
— COMMON QUESTIONS
A little clarity goes a long way.
How much extra fabric should I add?
This tool starts from a sample 4 in per side. Follow your quilter’s or machine’s own requirements.
Can a directional print be turned sideways?
No. Enable one-way print to restrict the valid layout.
Does it calculate diagonal backing?
No; a validated diagonal construction is needed before reporting cut quantities.