Convert Metric Count to Tex (Nm to tex)
Metric Count and tex are inversely related: tex = 1000 ÷ Nm, so 40 Nm = 25 tex.
Also searched as metric count to tex, metric count in tex, metric count into tex, Nm to tex, Nm in tex, Nm into tex and Nm to tex converter.
1 Nm = 1000 tex
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk Nm to tex converter to paste a column from Excel.
How to Convert Metric Count to Tex
- tex = 1000 ÷ Nm
- Nm = 1000 ÷ tex
- Example: convert 40 Nm to tex: 1000 ÷ 40 = 25 tex
Formula
tex = 1000 ÷ Nm
Derivation from SI units:
- Nm = kilometres of yarn per kilogram, so tex = 1000 ÷ Nm
- 1 tex = 1 g per 1000 m = 10⁻⁶ kg/m (exact)
- Solving for tex: tex = 1000 ÷ Nm (a higher Nm means a lower tex)
Both units are defined exactly, so the factor is exact. Metric Count definition: metric count; Tex definition: tex.
Worked examples
- A 40 Nm worsted yarn is 25 tex.
1000 ÷ 40 = 25 tex - Each single of a 2/48 knitting yarn, 48 Nm, is 20.83333333 tex.
1000 ÷ 48 = 20.83333333 tex
Metric Count to Tex conversion table
| Metric Count (Nm) | Tex |
|---|---|
| 10 Nm | 100 tex |
| 17 Nm | 58.82352941 tex |
| 20 Nm | 50 tex |
| 24 Nm | 41.66666667 tex |
| 34 Nm | 29.41176471 tex |
| 40 Nm | 25 tex |
| 50 Nm | 20 tex |
| 60 Nm | 16.66666667 tex |
| 68 Nm | 14.70588235 tex |
| 80 Nm | 12.5 tex |
| 100 Nm | 10 tex |
| 135 Nm | 7.407407407 tex |
Where it's used
Metric counts are converted to tex for ISO reporting and fabric engineering. Divide 1000 by the Nm value.
Metric Count to other yarn count units
| Conversion | 1 Nm equals |
|---|---|
| Nm to tex | 1000 tex |
| Nm to denier | 9000 den |
| Nm to Ne | 0.5905412474 Ne |
| Nm to decitex | 10000 dtex |
| 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 tex is a 2/48 Nm yarn?
Each single is 20.83333333 tex, so the two-ply yarn is about 41.7 tex before twist take-up.
What is the formula for metric count to tex?
tex = 1000 ÷ Nm. The two systems are inversely related, so divide the constant by the value; do not multiply. For example, 1000 ÷ 40 = 25 tex.
Why does a higher Nm give a lower tex?
Metric Count counts length per unit mass (an indirect system), while tex 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 tex conversion exact?
Yes. Both units are defined exactly, and 1 Nm is exactly 1000 tex.
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 Tex (Nm to tex). Retrieved October 25, 2026, from https://scientificconverters.com/yarn-count/nm-to-tex/
IEEE
Scientific Converters, "Convert Metric Count to Tex (Nm to tex)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/yarn-count/nm-to-tex/