How Much Quilt Backing Do I Need?
Learn how quilt dimensions, overhang, usable fabric width, seams and wide-back fabric affect backing yardage.
A complete 60 × 80-inch example
Add 4 inches on each side: the backing must cover 68 × 88 inches. Two 42-inch fabric widths joined with ¼-inch seams provide 83.5 inches of usable joined width. Cut each panel 88 inches long: 176 inches total ÷ 36 = 4.8889 yards, rounded up to 5 yards. Allow separately for shrinkage, squaring and print matching.
Near a width boundary, seams matter. Two 42-inch panels cannot make an 84-inch backing after sewing. The calculator accounts for that lost width and compares permitted orientations.
Start with the quilt top
Backing must be larger than the quilt top. Add the chosen overhang on every side before deciding how many widths of fabric are required. Long-arm quilters often request more overhang than domestic-machine quilting.
Use usable width, not the bolt label alone
A fabric sold as 44 in wide may have less usable width once selvedges are excluded. Enter the width you can actually sew with.
Panel layout changes yardage
Standard-width backing normally requires multiple joined panels. Wide-back fabric can remove seams and sometimes reduce total length purchased. Compare layouts before buying.
Last reviewed: 2026-09-14. Measurements and construction practices vary; verify project-specific requirements before cutting expensive fabric.