Fabric Width Converter — Convert Between Bolt Widths

Different fabric types are woven on different width looms. Quilting cotton is typically 112cm (44″), dressmaking fabrics 137–150cm, and furnishing fabrics 137cm (54″). Imported fabrics may use different standard widths.

No — it preserves total fabric area, which is the theoretical minimum. In practice pieces nest less efficiently on a narrower bolt, so add roughly 5–10% (or set the Layout Efficiency Factor to 1.05–1.10). On a narrow width some wide pieces may not fit across at all and would need a seam to split them.

If any single pattern piece is wider than the fabric bolt, you cannot simply convert — you will need to add a seam to split the piece, or choose a wider fabric. This calculator assumes all pieces fit within the bolt width.