Denier Calculator
The Standard Measure of Filament Fineness
Denier is the numbering system most associated with synthetic filament yarns, hosiery, and technical fabrics — a 15-denier stocking is famously sheer, while a 1000-denier nylon is thick enough for luggage and tactical gear. Like Tex, it's a direct system: a larger number means a thicker, heavier yarn, based on a fixed reference length of 9,000 meters.
The Formulas
Tex = Denier ÷ 9
Decitex (dtex) = Denier × 10 ÷ 9
Tex and Denier are closely related direct numbering systems that differ only by their reference length (1,000 m for Tex versus 9,000 m for Denier), which is why converting between them is a simple fixed ratio. Decitex, common in European specifications, is Denier scaled to a 10,000 m reference length.
Where This Matters
- Hosiery and legwear — denier is the standard consumer-facing spec for tights and stockings, directly indicating sheerness versus opacity.
- Technical and outdoor fabrics — ripstop nylon, luggage fabric, and tactical gear are commonly specified and marketed by denier count (e.g. "1000D nylon").
- Comparing yarn across specs written in Tex or dtex — converting to a common system lets a buyer compare filament yarns quoted in different numbering conventions.
Worked Example
| System | Result |
|---|---|
| Denier | 90.0 |
| Tex | 10.0 |
| Decitex (dtex) | 100.0 |
How to Use This Calculator
- Enter the Weight of the yarn sample in grams.
- Enter the Length of that same sample in meters.
- Select Calculate to see the result in Denier, Tex, and Decitex simultaneously.
Related Calculations
For spun yarns across all four major numbering systems, use the Yarn Count Calculator, or check a woven fabric's areal weight with the GSM Calculator.