Convert Metric Count to Decitex (Nm to dtex)
Metric Count and decitex are inversely related: dtex = 10000 ÷ Nm, so 15 Nm = 666.6666667 dtex.
Also searched as metric count to dtex, metric count in dtex, metric count into decitex, Nm to dtex, Nm in decitex, Nm into decitex, metric count to decitex and Nm to decitex converter.
1 Nm = 10000 dtex
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Nm to decitex converter to paste a column from Excel.
How to Convert Metric Count to Decitex
- dtex = 10000 ÷ Nm
- Nm = 10000 ÷ dtex
- Example: convert 15 Nm to dtex: 10000 ÷ 15 = 666.6666667 dtex
Formula
dtex = 10000 ÷ Nm
Derivation from SI units:
- Nm = kilometres of yarn per kilogram, so tex = 1000 ÷ Nm
- 1 dtex = 1 g per 10 000 m = 0.1 tex = 10⁻⁷ kg/m (exact)
- Solving for dtex: dtex = 10000 ÷ Nm (a higher Nm means a lower dtex)
Both units are defined exactly, so the factor is exact. Metric Count definition: metric count; Decitex definition: decitex.
Worked examples
- A reading of 34 Nm converts to 294.1176471 dtex.
10000 ÷ 34 = 294.1176471 dtex - A value of 68 Nm is 147.0588235 dtex.
10000 ÷ 68 = 147.0588235 dtex
Metric Count to Decitex conversion table
| Metric Count (Nm) | Decitex (dtex) |
|---|---|
| 10 Nm | 1000 dtex |
| 17 Nm | 588.2352941 dtex |
| 20 Nm | 500 dtex |
| 24 Nm | 416.6666667 dtex |
| 34 Nm | 294.1176471 dtex |
| 40 Nm | 250 dtex |
| 50 Nm | 200 dtex |
| 60 Nm | 166.6666667 dtex |
| 68 Nm | 147.0588235 dtex |
| 80 Nm | 125 dtex |
| 100 Nm | 100 dtex |
| 135 Nm | 74.07407407 dtex |
Where it's used
Metric Count are used for wool, linen and spun yarns in continental Europe, while decitex appear in polyester and nylon filament yarns (for example 167 dtex). 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.
Metric Count to other yarn count units
| Conversion | 1 Nm equals |
|---|---|
| Nm to decitex | 10000 dtex |
| Nm to tex | 1000 tex |
| Nm to denier | 9000 den |
| Nm to Ne | 0.5905412474 Ne |
| Nm to Nw | 0.8858118712 Nw |
| Nm to kilotex | 1 ktex |
| Nm to woollen count | 1.937713468 NY |
| Nm to linen lea | 1.653515493 NeL |
Show 1 more units
| Nm to kilogram per metre | 0.001 kg/m |
|---|
Frequently asked questions
What is the formula for metric count to decitex?
dtex = 10000 ÷ Nm. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 10000 ÷ 15 = 666.6666667 dtex.
Why does a higher Nm give a lower dtex?
Metric Count counts length per unit mass (an indirect system), while decitex counts mass per unit length (a direct system). A finer yarn has a higher indirect number and a lower direct number.
Is the Nm to dtex conversion exact?
Yes. Both units are defined exactly, and 1 Nm is exactly 10000 dtex.
Sources
- ASTM D2260, Standard Tables of Conversion Factors and Equivalent Yarn Numbers Measured in Various Numbering Systems, ASTM International , Metric count (Nm).
- 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".
- ISO 1144, Textiles — Universal system for designating linear density (Tex System), International Organization for Standardization , Tex system.
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 Metric Count to Decitex (Nm to dtex). Retrieved October 25, 2026, from https://scientificconverters.com/yarn-count/nm-to-decitex/
IEEE
Scientific Converters, "Convert Metric Count to Decitex (Nm to dtex)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/yarn-count/nm-to-decitex/