Yarn count converter

Denier to Dtex Converter

Convert filament yarn from denier to decitex (dtex), the unit European suppliers and many export specifications use.

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Constants from ASTM D2260 and the exact yard and pound. Checked 9 November 2026.

Your yarn

Count

denier

Unit you have

Denier: grams per 9,000 m

Convert to

Decitex (dtex): grams per 10,000 m

Filaments (optional)

filaments

For filament yarn: the 36 in 75/36 or the f48 in dtex 167 f48.

Converted count

150 denier in Dtex

166.7 dtex

dtex = denier × 10 ÷ 9150 × 10 ÷ 9 = 166.7

Every unit

Denierwhat you entered: 150 denier
Texgrams per 1,000 m: 16.67 tex
Decitex (dtex)grams per 10,000 m: 166.7 dtex
English cotton count (Ne)840-yard hanks per pound: 35.43 Ne
Metric count (Nm)km per kg (metres per gram): 60 Nm
Worsted count (Nw)560-yard hanks per pound: 53.15 Nw
Yorkshire woollen count (Ny)256-yard skeins per pound: 116.3 Ny

Higher denier, tex or dtex means a thicker yarn. Higher Ne, Nm, Nw or Ny means a finer one.

Denier to Dtex chart

Denier	Dtex	Tex
	11.11	1.111
	16.67	1.667
	22.22	2.222
	33.33	3.333
	44.44	4.444
	55.56	5.556
	77.78	7.778
	83.33	8.333
	111.1	11.11
	166.7	16.67
	233.3	23.33
	333.3	33.33
	466.7	46.67
	666.7	66.67
	933.3	93.33
	1,111	111.1

Tap a value in the first column to load it into the converter.

How to use it

Type the count in denier, for example 150.
Read the Dtex on the right, with every other unit listed under it.
Or tap a value in the Denier to Dtex chart to load it.

Denier to Dtex: when you need it

Denier and decitex measure the same thing, the weight of a fixed length of yarn, over different lengths: 9,000 metres for denier and 10,000 metres for dtex. Filament from India and China is usually quoted in denier; European suppliers and many technical specs quote dtex. Spandex and nylon labels often show both.

Both are direct systems, so the conversion is a plain ratio. The dtex figure is always about 11% higher than the denier figure for the same yarn.

Formula: dtex = denier × 10 ÷ 9

dtex = denier × 10 ÷ 9, about denier × 1.111. The same yarn weighs 10/9 as much over 10,000 m as over 9,000 m.

Worked example

150 denier: 150 × 10 ÷ 9 = 166.7 dtex.

More conversions

To go the other way, use the Dtex to Denier converter. To see one count in all seven units at once, including worsted and woollen counts, open the yarn count converter. To estimate fabric weight from yarn counts, try the fabric GSM calculator.

Sources: ASTM D2260, Standard Tables of Conversion Factors and Equivalent Yarn Numbers (current edition D2260-24); ISO 1144:2016, the tex system. Checked 9 November 2026.

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FAQ

Questions

How many dtex is 150 denier?

166.7 dtex (150 × 10 ÷ 9). Suppliers round it to 167 dtex, which is why 150 denier polyester often appears as dtex 167 on spec sheets.

What is the formula for denier to dtex?

dtex = denier × 10 ÷ 9 (about denier × 1.111). It works because denier weighs 9,000 m and dtex weighs 10,000 m of the same yarn. 75 denier × 10 ÷ 9 = 83.33 dtex.

Is dtex the same as decitex?

Yes. Dtex is short for decitex, a tenth of a tex: grams per 10,000 m. 1 tex = 10 dtex, so 150 denier is 16.67 tex or 166.7 dtex.

What are 20, 40 and 70 denier in dtex?

22.22, 44.44 and 77.78 dtex. Spandex and fine nylon in these sizes are usually labelled 22, 44 and 78 dtex.

Why do some suppliers use dtex instead of denier?

Tex and dtex belong to the tex system, the one ISO 1144 sets out for yarn linear density, so European mills and technical buyers use it. Denier is still the everyday unit for filament in India. The two convert exactly, so either works on a purchase order as long as the unit is written down.

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