Convert Yorkshire Woollen Count to Worsted Count (NY to Nw)
1 Yorkshire woollen count (NY) = 0.4571428571 worsted count (Nw). 1 Nw = 2.1875 NY. Example: 15 NY = 15 × 0.4571428571 = 6.857142857 Nw.
Also searched as Yorkshire woollen count to Nw, Yorkshire woollen count in Nw, Yorkshire woollen count into worsted count, NY to Nw, NY in worsted count, NY into worsted count, Yorkshire woollen count to worsted count and NY to worsted count converter.
1 NY = 0.4571428571 Nw
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk woollen count to Nw converter to paste a column from Excel.
How to Convert Yorkshire Woollen Count to Worsted Count
- 1 NY = 0.4571428571 Nw
- 1 Nw = 2.1875 NY
- Example: convert 15 NY to Nw: 15 NY = 15 × 0.4571428571 Nw = 6.857142857 Nw
Formula
Nw = NY × 0.4571428571429
or Nw = NY ÷ 2.1875
Derivation from SI units:
- Yorkshire woollen count = number of 256-yard skeins per pound, so tex = 1937.7 ÷ count
- Nw = number of 560-yard hanks per pound, so tex = 885.8119 ÷ Nw
- 1 NY = 0.00193771346819 kg/m ÷ 0.0008858118711724 kg/m per Nw = 0.4571428571429 Nw
Both units are defined exactly, so the factor is exact. Yorkshire Woollen Count definition: Yorkshire woollen count; Worsted Count definition: worsted count.
Worked examples
- A reading of 10 NY converts to 4.571428571 Nw.
10 NY × 0.4571428571 = 4.571428571 Nw - A value of 20 NY is 9.142857143 Nw.
20 NY × 0.4571428571 = 9.142857143 Nw
Yorkshire Woollen Count to Worsted Count conversion table
| Yorkshire Woollen Count (NY) | Worsted Count (Nw) |
|---|---|
| 4 NY | 1.828571429 Nw |
| 6 NY | 2.742857143 Nw |
| 8 NY | 3.657142857 Nw |
| 10 NY | 4.571428571 Nw |
| 12 NY | 5.485714286 Nw |
| 16 NY | 7.314285714 Nw |
| 20 NY | 9.142857143 Nw |
| 24 NY | 10.97142857 Nw |
| 30 NY | 13.71428571 Nw |
| 40 NY | 18.28571429 Nw |
Where it's used
Yorkshire Woollen Count are used for woollen-spun yarns for tweeds and blankets, while worsted count appear in worsted wool and acrylic yarns. Both measure yarn count (linear density of yarns and fibres), so the conversion is a fixed factor.
Yorkshire Woollen Count to other yarn count units
| Conversion | 1 NY equals |
|---|---|
| woollen count to Nw | 0.4571428571 Nw |
| woollen count to tex | 1937.713468 tex |
| woollen count to denier | 17439.42121 den |
| woollen count to Ne | 0.3047619048 Ne |
| woollen count to decitex | 19377.13468 dtex |
| woollen count to Nm | 0.5160721729 Nm |
| woollen count to kilotex | 1.937713468 ktex |
| woollen count to linen lea | 0.8533333333 NeL |
Show 1 more units
| woollen count to kilogram per metre | 0.001937713468 kg/m |
|---|
Frequently asked questions
How many worsted count are in 1 Yorkshire woollen count?
1 NY = 0.4571428571 Nw.
How do I convert Yorkshire woollen count to worsted count?
Multiply the value in NY by 0.4571428571, or divide it by 2.1875. For example, 15 NY × 0.4571428571 = 6.857142857 Nw.
Is the NY to Nw conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
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".
- ASTM D2260, Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems, ASTM International , Worsted count.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Yorkshire Woollen Count to Worsted Count (NY to Nw). Retrieved October 25, 2026, from https://scientificconverters.com/yarn-count/woollen-count-to-worsted-count/
IEEE
Scientific Converters, "Convert Yorkshire Woollen Count to Worsted Count (NY to Nw)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/yarn-count/woollen-count-to-worsted-count/