Quilt Backing Calculator

Overage is added on all four sides. Fabric width means usable width after selvages, and each panel seam consumes the entered seam allowance on both joined edges. The 4-inch value is a longarm-oriented default; requirements vary, so confirm with your quilter before purchasing.

The calculator finds the required panel count for vertical and horizontal seams, accounts for width lost in joins, and compares the fabric consumed. Directional fabric removes the rotated candidate. Safety and purchase rounding are applied to each valid layout, and every candidate remains visible. Seam orientation can also depend on print direction and your quilting setup. If using a professional longarmer, confirm their preferences.

A 60 × 72 inch quilt with 4 inches extra per side needs backing at least 68 × 80 inches. With 40 usable inches, two 80-inch panels cover the width; the calculator compares that with the horizontal alternative before identifying the lowest-yardage option. A two-panel layout may place one center seam along the quilt, subject to print direction and quilting setup.