Quilt Backing Calculator: Yardage, Seam Direction, and Wideback Options

Quilt calculator backing guide: yardage with 4-inch overhang, horizontal vs vertical seams on 44-inch fabric, and when a 108-inch wideback costs less.

Quilt Backing Calculator

Quilt Top Width (in)

Quilt Top Length (in)

Overhang per Side (in)

Fabric Width

Directional Print?

Shrinkage / Waste (%)

Fabric to Buy

5.25 yds

Backing Size Needed

68" × 88"

Panels & Seams

2 panels, 1 seam

Best Layout

vertical (panels run the quilt length)

Dashed lines are seams. The other orientation would need 6 yds (3 panels).

ℹ️ Longarm quilters usually want 4"+ of backing on every side — check before trimming the overhang down.