Convert Denier to Yorkshire Woollen Count (den to NY)
Denier and Yorkshire woollen count are inversely related: NY = 17439.42121 ÷ den, so 15 den = 1162.628081 NY.
Also searched as denier to NY, denier in NY, denier into Yorkshire woollen count, den to NY, den in Yorkshire woollen count, den into Yorkshire woollen count, denier to Yorkshire woollen count and den to Yorkshire woollen count converter.
1 den = 17439.42121 NY
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk denier to woollen count converter to paste a column from Excel.
How to Convert Denier to Yorkshire Woollen Count
- NY = 17439.42121 ÷ den
- den = 17439.42121 ÷ NY
- Example: convert 15 den to NY: 17439.42121 ÷ 15 = 1162.628081 NY
Formula
NY = 17439.42121371 ÷ den
Derivation from SI units:
- 1 den = 1 g per 9000 m = 1/9 tex ≈ 1.111 × 10⁻⁷ kg/m (exact)
- Yorkshire woollen count = number of 256-yard skeins per pound, so tex = 1937.7 ÷ count
- Solving for NY: NY = 17439.42121371 ÷ den (a higher den means a lower NY)
Both units are defined exactly, so the factor is exact. Denier definition: denier; Yorkshire Woollen Count definition: Yorkshire woollen count.
Worked examples
- A reading of 40 den converts to 435.9855303 NY.
17439.42121 ÷ 40 = 435.9855303 NY - A value of 150 den is 116.2628081 NY.
17439.42121 ÷ 150 = 116.2628081 NY
Denier to Yorkshire Woollen Count conversion table
| Denier (den) | Yorkshire Woollen Count (NY) |
|---|---|
| 10 den | 1743.942121 NY |
| 15 den | 1162.628081 NY |
| 20 den | 871.9710607 NY |
| 30 den | 581.3140405 NY |
| 40 den | 435.9855303 NY |
| 50 den | 348.7884243 NY |
| 70 den | 249.1345888 NY |
| 75 den | 232.5256162 NY |
| 100 den | 174.3942121 NY |
| 150 den | 116.2628081 NY |
| 210 den | 83.04486292 NY |
| 420 den | 41.52243146 NY |
| 840 den | 20.76121573 NY |
| 1000 den | 17.43942121 NY |
Where it's used
Denier are used for hosiery and tights (for example 15–40 den), while Yorkshire woollen count appear in woollen-spun yarns for tweeds and blankets. 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.
Denier to other yarn count units
| Conversion | 1 den equals |
|---|---|
| denier to woollen count | 17439.42121 NY |
| denier to tex | 0.1111111111 tex |
| denier to Ne | 5314.871227 Ne |
| denier to decitex | 1.111111111 dtex |
| denier to Nm | 9000 Nm |
| denier to Nw | 7972.306841 Nw |
| denier to kilotex | 0.0001111111111 ktex |
| denier to linen lea | 14881.63944 NeL |
Show 1 more units
| denier to kilogram per metre | 1.111111111 × 10⁻⁷ kg/m |
|---|
Frequently asked questions
What is the formula for denier to Yorkshire woollen count?
NY = 17439.42121 ÷ den. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 17439.42121 ÷ 15 = 1162.628081 NY.
Why does a higher den give a lower NY?
Yorkshire Woollen Count counts length per unit mass (an indirect system), while denier counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the den to NY 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 , Denier system.
- 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 , Woollen count (Yorkshire skeins).
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 Denier to Yorkshire Woollen Count (den to NY). Retrieved October 25, 2026, from https://scientificconverters.com/yarn-count/denier-to-woollen-count/
IEEE
Scientific Converters, "Convert Denier to Yorkshire Woollen Count (den to NY)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/yarn-count/denier-to-woollen-count/