Interactive calculator

Quilt backing calculator

Calculate backing cut size, panel count, and yardage for both fabric orientations from your quilt and usable fabric width.

Enter your measurements

Results update automatically and stay on your device.

Quilt widthinQuilt lengthinExtra on every sideinUsable fabric widthin

Measure usable width after removing selvages. The lower-yardage layout may rotate a directional print; choose the other layout when print direction matters.

Backing cut size68 × 80 inIncludes the extra entered on all four sides.Lower-yardage layout3.78 yd2 fabric widths, cut across the quilt width. Round up to a practical purchase increment.

Other orientation: 4.44 yd. Seaming and pattern matching may require more.

PROJECT RECORD

Save the estimate and compare it with actual use

Current estimate: 3.78 yd backing

This optional record stays in this browser. It is a project note—not inventory, accounting, pricing, or tax software. Browser storage can be cleared and is not a backup.

Project titleActual material usedUnitTime spentminutesMaterial or progress notes

Continue to binding

Formula

Backing dimensions = quilt dimensions + twice the side overage. Panels = backing span ÷ usable fabric width, rounded up. Yardage = panel count × cut length ÷ 36.

Source notes

Last reviewed September 13, 2026

American Quilter's Society: Quilt Sizes Chart Suggested quilt-dimension guidance; not a formal sizing standard.