What is the difference between Tex and Denier?

Both measure how heavy a fiber or yarn is per unit length. Tex is grams per 1 km of yarn; Denier is grams per 9 km. A lower Tex or Denier number means a finer, lighter yarn. Tex is the SI unit preferred in ISO standards, while Denier is still widely used in hosiery, apparel, and the US market.

What is Decitex (dtex)?

Decitex (dtex) is one-tenth of a Tex — grams per 10 km of yarn. Many European and Asian manufacturers list fiber fineness in dtex because it gives a round number for very fine fibers without decimals. To convert: dtex = Tex × 10, or dtex = Denier ÷ 0.9.

How do I convert Denier to Tex?

Divide the Denier value by 9. For example, 90 Denier = 10 Tex. Equivalently, multiply Tex by 9 to get Denier. These are exact relationships defined by the unit definitions (Tex = g/km, Denier = g/9km).

What Tex or Denier value is considered fine vs. coarse?

For reference: silk is roughly 1–3 Denier (0.1–0.3 Tex); fine merino wool is ~15–20 Dtex; standard hosiery nylon is 20–70 Denier; carpet yarn can exceed 1000 Denier. Lower numbers = finer fiber.

Does this converter handle very small or very large values?

Yes. You can enter microfiber values like 0.5 Denier or heavy industrial yarn like 5000 Tex. The converter uses standard JavaScript floating-point arithmetic and displays results to four decimal places to avoid rounding errors on fine fibers.

Tex to Denier Converter

Name: Tex to Denier Converter
Availability: InStock
Author: Nham Vu

Convert yarn linear density between Tex, Denier, and Decitex (dtex) units instantly, with a quick-reference table for common fiber types.

Convert Linear Density

Tex (g / km)

Denier (g / 9 km)

Decitex (dtex) (g / 10 km)

Conversion formulas

Denier = Tex × 9

Decitex = Tex × 10

Tex = Denier ÷ 9

Tex = Decitex ÷ 10

Common Fiber Reference

Fiber / Yarn	Tex	Denier	dtex

Values shown are typical midpoints; actual fiber specs vary by manufacturer and grade.

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Summary

Convert yarn linear density between Tex, Denier, and Decitex (dtex) units instantly, with a quick-reference table for common fiber types.

How it works

Enter a numeric value in any of the three fields (Tex, Denier, or Decitex).
The converter applies the formulas: Denier = Tex × 9; Decitex = Tex × 10.
The other two fields update instantly with the converted values.
Click "Copy" next to any result to copy it to your clipboard.
Scroll down for a quick-reference table showing common fiber types and their typical Tex and Denier values.

Use cases

Convert a yarn spec sheet from Denier to Tex for ISO-standard documentation.
Cross-check a supplier's dtex rating against the Denier value on your design brief.
Quickly look up typical linear density for silk, nylon, polyester, or cotton.
Verify fiber fineness when comparing synthetic and natural yarn options.
Convert between units when working with both European (Tex) and American (Denier) sourcing.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu