Knitting
A fabric at its reference relaxed state lands on predictable K values regardless of yarn or gauge.
— Kc/Kw
Courses to wales ratio
Dry-relaxed single jersey typically shows Kc near 5.0 and Kw near 3.8. Values well below that mean the sample has not relaxed and will move again after washing.
Loop Shape Factor & Fabric Density Calculator — free, with the formula and a worked example, at Textile School.