Weaving & Fabric Construction
Crimp references fabric length, take-up references yarn length. Mixing them up costs you yarn.
— %
Extra warp length consumed by interlacing
Crimp interchanges between warp and weft: tighten one and the other flattens. Measure at least ten threads in each direction on a conditioned sample.
Warp & Weft Crimp Percentage Calculator — free, with the formula and a worked example, at Textile School.