Strip Piecing Calculator
Turn finished strip widths into cut widths (seam allowance added), see strips per width of fabric, and total yardage for jelly-roll and strip-set quilts.
How strip piecing math works
Strip piecing sews long strips together, then crosscuts the set into ready-made units. You cut each strip at its finished width plus two seam allowances — ¼″ on each long edge.
cut width = finished width + (2 × seam allowance)
fabric per strip = cut width × width of fabric
segments per strip = usable width ÷ segment width
fabric per strip = cut width × width of fabric
segments per strip = usable width ÷ segment width
Jelly rolls are pre-cut strips
A jelly roll is forty 2½″ strips — already cut, so the math is done for you. If you're designing your own, the jelly-roll quilt math guide shows how many strips a quilt needs.
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