Knitted Fabric Yield
The trim costs three per cent. The marker that does not quite fit twice costs more.
— cm
Needle count divided by wales per centimetre
Open width is calculated from needle count and finished wales per centimetre, which assumes the fabric is measured relaxed and conditioned; a width taken on tensioned fabric or on greige will be substantially different and will make the marker fit wrong in the optimistic direction. Needle count is the geometric figure from gauge and diameter and ignores needles removed for a pattern or missing through breakage. The model assumes one slit and two trimmed edges; some qualities are slit at both needle lines of a two-track machine or trimmed asymmetrically, and the trim should then be entered as the total halved. Marker fit is computed for a single marker width repeated across; mixed markers of different widths nested across the fabric will do better than this figure and should be planned in a marker system rather than here. The surplus strip is priced at full fabric value, which is deliberate: any recovery value belongs in a separate calculation.
Knit Tube Slitting: Open Width, Trim Loss & Marker Fit — free, with the formula and a worked example, at Textile School.