Plan · cut · piece

Quilt backing,
pieced with a plan.

Compare full-width panels with a three-piece T-seam layout. See the raw cut sizes, purchase length, and how the pieces fit together before you cut.

Your chosen overhang is a planning input, not a guarantee of longarm suitability. Confirm it and the seam placement with your quilter.

Your measurements

Enter finished quilt size and usable fabric width. Switch between centimeters and inches without re-entering your measurements.

Measurement units

Quilt width in Quilt height in Usable fabric width inAfter selvages are removed Extra per side inYour chosen backing overhang Seam allowance in per edge Purchase increment

Keep grain and directional print alignedLength runs along quilt height. The calculator will not rotate this fabric. Include a T-seam comparisonAccept an extra cross seam and confirm its placement with your quilter.

Check length I already have Optional

Available fabric length ydCompared with raw cut length; purchase rounding is not cutting margin.

How the estimate works

Every join consumes two seam allowances: one from each joined edge.

Full-width panels
Uses as many fabric-width panels as needed to cover the requested backing width after joining. Extra width is trimmed after sewing.

Three-piece T-seam
Uses one full-length main panel and two shorter, side-by-side cuts. It can use less length, with one additional seam to sew.

This is a cut-planning aid, not a sewing pattern. It assumes square cuts, no stretching, and the same orientation for every piece. Grain/print alignment is not motif matching.

Further reading: APQS: How to piece quilt backs · Quilters Paradise calculators. These links are context, not endorsements.

Quilt backing,pieced with a plan.

Your measurements

Choose a layout to inspect

How the estimate works

Quilt backing,
pieced with a plan.