Denier (den)
The denier is the mass in grams of 9000 metres of filament or yarn. Like tex it is a direct count, so a finer filament has a lower denier; 9 denier = 1 tex.
Symbol: den
Quantity: yarn count (linear density of yarns and fibres)
SI relation: 1 den = 1.111111111111 × 10⁻⁷ kg/m (exact)
Derivation: 1 den = 1 g per 9000 m = 1/9 tex ≈ 1.111 × 10⁻⁷ kg/m (exact)
Exact: yes, by definition
History
The denier comes from the historic silk trade and is still the common unit for silk, nylon and polyester filaments, especially in the United States and Asia.
Typical uses
- Hosiery and tights (for example 15–40 den)
- Nylon and polyester filament yarns
- Bag and luggage fabrics (210D, 420D, 840D)
Convert denier to other units
| Conversion | 1 den equals | Reverse |
|---|---|---|
| denier to tex | 0.1111111111 tex | tex to denier |
| denier to Ne | 5314.871227 Ne | Ne to denier |
| denier to decitex | 1.111111111 dtex | decitex to denier |
| denier to Nm | 9000 Nm | Nm to denier |
| denier to Nw | 7972.306841 Nw | Nw to denier |
| denier to kilotex | 0.0001111111111 ktex | kilotex to denier |
| denier to woollen count | 17439.42121 NY | woollen count to denier |
| denier to linen lea | 14881.63944 NeL | linen lea to denier |
| denier to kilogram per metre | 1.111111111 × 10⁻⁷ kg/m | kilogram per metre to denier |
Open the Yarn Count Converter to convert any value between all units.
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".
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). Denier (den). Retrieved October 25, 2026, from https://scientificconverters.com/units/denier/
IEEE
Scientific Converters, "Denier (den)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/units/denier/