Yorkshire Woollen Count to Kilograms per Metre (NY to kg/m)

Formula

kg/m = 0.00193771346819 ÷ NY

Derivation from SI units:

• Yorkshire woollen count = number of 256-yard skeins per pound, so tex = 1937.7 ÷ count
• The coherent SI unit of linear density: mass in kilograms per metre of length.
• Solving for kg/m: kg/m = 0.00193771346819 ÷ NY (a higher NY means a lower kg/m)

Both units are defined exactly, so the factor is exact. Yorkshire Woollen Count definition: Yorkshire woollen count; Kilogram per Metre definition: kilogram per metre.

Worked examples

1. A reading of 10 NY converts to 0.0001937713468 kg/m.
   0.001937713468 ÷ 10 = 0.0001937713468 kg/m
2. A value of 20 NY is 0.00009688567341 kg/m.
   0.001937713468 ÷ 20 = 0.00009688567341 kg/m

Where it's used

Yorkshire Woollen Count are used for woollen-spun yarns for tweeds and blankets, while kilograms per metre appear in ropes, cables and heavy tows. Both measure yarn count (linear density of yarns and fibres), but one system is the inverse of the other, so a fixed constant is divided by the value.

Yorkshire Woollen Count to other yarn count units

Frequently asked questions

Sources

• ASTM D2260, Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems, ASTM International , Woollen count (Yorkshire skeins).
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "yard" and "pound".
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures .

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.