Yarn Count Converter: Denier, Tex, Dtex, Ne and Nm
Convert yarn counts between denier, tex, decitex, English count (Ne) and metric count (Nm) in one step.
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Constants from ASTM D2260 and the exact yard and pound. Checked 9 November 2026.
Your yarn
Unit you have
Denier: grams per 9,000 m
Convert to
English cotton count (Ne): 840-yard hanks per pound
For filament yarn: the 36 in 75/36 or the f48 in dtex 167 f48.
Converted count
75 denier in Ne
70.86 Ne
Ne = 5,314.87 ÷ denier5,314.87 ÷ 75 = 70.86
Every unit
- Denierwhat you entered
- 75 denier
- Texgrams per 1,000 m
- 8.333 tex
- Decitex (dtex)grams per 10,000 m
- 83.33 dtex
- English cotton count (Ne)840-yard hanks per pound
- 70.86 Ne
- Metric count (Nm)km per kg (metres per gram)
- 120 Nm
- Worsted count (Nw)560-yard hanks per pound
- 106.3 Nw
- Yorkshire woollen count (Ny)256-yard skeins per pound
- 232.5 Ny
Per filament
- Denier per filament (dpf)
- 2.083
- Dtex per filament
- 2.315
Higher denier, tex or dtex means a thicker yarn. Higher Ne, Nm, Nw or Ny means a finer one.
Common filament deniers in tex, dtex, Ne and Nm
| Denier | Tex | Dtex | Ne | Nm |
|---|---|---|---|---|
| 2.222 | 22.22 | 265.7 | 450 | |
| 3.333 | 33.33 | 177.2 | 300 | |
| 4.444 | 44.44 | 132.9 | 225 | |
| 5.556 | 55.56 | 106.3 | 180 | |
| 8.333 | 83.33 | 70.86 | 120 | |
| 11.11 | 111.1 | 53.15 | 90 | |
| 16.67 | 166.7 | 35.43 | 60 | |
| 22.22 | 222.2 | 26.57 | 45 | |
| 33.33 | 333.3 | 17.72 | 30 | |
| 50 | 500 | 11.81 | 20 | |
| 66.67 | 666.7 | 8.858 | 15 |
Tap a value in the first column to load it into the converter.
How to use it
Type the count and pick the unit you have, for example 75 denier.
Pick the unit you want. The answer shows large, with every other unit listed under it.
For filament yarn, add the filament count (the 36 in 75/36) to see denier per filament.
Direct and indirect yarn counts
A yarn count says how thick a yarn is by relating its length to its weight. There are two families. Direct systems weigh a fixed length: denier is grams per 9,000 m, tex is grams per 1,000 m and decitex (dtex) is grams per 10,000 m, so a bigger number is a thicker yarn. Indirect systems count length per unit of weight: English cotton count (Ne), metric count (Nm) and the wool counts, so a bigger number is a finer yarn.
In Surat, polyester and nylon filament is bought by denier, usually with its filament count, such as 75/36. Spun cotton and blended yarns are sold by English count, such as 30s or 40s. Lab reports and export specs often use tex or dtex. This converter puts all of them side by side.
The formulas
Every conversion here goes through tex:
| Unit | What it measures | From tex |
|---|---|---|
| Denier | grams per 9,000 m | 9 × tex |
| Dtex | grams per 10,000 m | 10 × tex |
| Nm | km per kg | 1,000 ÷ tex |
| Ne | 840-yard hanks per pound | 590.54 ÷ tex |
| Nw | 560-yard hanks per pound | 885.81 ÷ tex |
| Ny | 256-yard skeins per pound | 1,937.71 ÷ tex |
The English constants come from the exact yard (0.9144 m) and pound (453.59237 g). For Ne, one pound is 453.59237 g and 840 yards is 0.768096 km, so Ne × tex = 453.59237 ÷ 0.768096 = 590.54. ASTM D2260, the standard table of yarn number conversions, gives 590.541 for cotton count and 885.812 for worsted count. The shortcuts that skip tex follow from these: Ne = 5,314.87 ÷ denier, Nm = 9,000 ÷ denier and Nm = 1.6934 × Ne.
Worked example: 75/36 polyester
75 denier ÷ 9 = 8.333 tex, which is 83.33 dtex. Ne = 590.54 ÷ 8.333 = 70.86, the same as 5,314.87 ÷ 75. Nm = 1,000 ÷ 8.333 = 120. With 36 filaments, each filament is 75 ÷ 36 = 2.083 denier, or 2.315 dtex.
Common mistakes
- Reading Ne like denier. 60s is finer than 30s, but 60 denier is finer than 300 denier.
- Using 590.54 on a denier. That constant is for tex; with denier, use 5,314.87.
- Forgetting plies. 2/40s is two 40s yarns twisted together and weighs about the same as a single 20s.
- Treating a filament yarn and a spun yarn of the same count as the same yarn. They weigh the same per metre, but bulk, cover and handle differ.
When a converter isn't enough
If you buy yarn in several systems, issue it to looms or job workers and reconcile it against the fabric that comes back, yarn stock has to live in one unit with the conversions done for you. That is the job of a textile ERP: yarn, grey, job work and finished stock in one system. To estimate fabric weight from these counts, use the fabric GSM calculator, then the fabric metre to kg calculator to turn GSM into weight per metre.
Sources: ASTM D2260, Standard Tables of Conversion Factors and Equivalent Yarn Numbers (current edition D2260-24; its table gives cotton count = 590.541 ÷ tex and worsted count = 885.812 ÷ tex); ISO 1144:2016, the tex system for linear density; unit definitions from the Swicofil yarn manual. Checked 9 November 2026.
FAQ
Questions
Which yarn count systems are direct and which are indirect?
Denier, tex and dtex are direct: they weigh a fixed length, so a bigger number is a thicker yarn. Ne, Nm, Nw and Ny are indirect: they measure length per unit of weight, so a bigger number is a finer yarn. Converting between the two families always means dividing a constant by the count.
What does 75/36 mean on polyester yarn?
75 denier made of 36 filaments, so each filament is about 2.083 denier. 75/72 has the same total weight in twice as many filaments of 1.042 denier each, which gives a softer handle. Enter the filament count in the converter to see denier and dtex per filament.
What are the formulas for converting yarn counts?
Go through tex: denier = 9 × tex, dtex = 10 × tex, Nm = 1,000 ÷ tex, Ne = 590.54 ÷ tex, Nw = 885.81 ÷ tex and Ny = 1,937.71 ÷ tex. From denier directly: Ne = 5,314.87 ÷ denier and Nm = 9,000 ÷ denier.
How do I convert a plied count like 2/40s or 2 × 75 denier?
For indirect counts (Ne, Nm), divide by the number of plies: 2/40s behaves like a single 20s. For direct counts (denier, tex, dtex), add the plies: two ends of 75 denier make 150 denier. Twist takes up a little length, so the real plied yarn is slightly heavier than this.
What are worsted (Nw) and Yorkshire woollen (Ny) counts?
Older English systems used for wool. Worsted count is the number of 560-yard hanks in a pound (Nw = 885.81 ÷ tex). Yorkshire woollen count is the number of 256-yard skeins in a pound (Ny = 1,937.71 ÷ tex). A 40s cotton count is 60 Nw and 131.3 Ny.
Why does my supplier's chart differ slightly from this converter?
Charts round the constants, using 5,315, 591 or 1.69 instead of 5,314.87, 590.54 and 1.6934, and spec sheets round dtex to whole numbers, such as 167 dtex for 150 denier. Differences in the second decimal come from that rounding, not from a different system.
Which unit should I use when buying yarn in Surat?
Use the unit your supplier quotes, and convert only to compare. Filament yarn, such as polyester, nylon and viscose filament, is usually quoted in denier with its filament count (75/36). Spun yarn, such as cotton, spun polyester and blends, is quoted in English count (30s, 2/40s).
Textile ERP
Yarn, grey, job work and finished stock in one system built around your process.
Mind Over Matter builds it for Surat businesses and clients across India. Reply within 24 hours.
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