This page explains how to convert a yarn count between the Ne and Tex systems, and it is for anyone who reads or writes a fabric or yarn spec: a merchandiser, a buyer, a product developer, or a student. This lesson mainly teaches the information flow: how one fact about a yarn, its fineness, can arrive in two different systems, and how to turn one into the other so both sides mean the same yarn. Order A's T-shirt uses Ne 30/1 combed cotton, a count in the English system. A buyer meets Tex on almost any spec from outside the supplier's usual customer base, since Tex is used more widely across fibre types than Ne is.
Without this skill, a person reads a Tex number and assumes it behaves like an Ne number, or the reverse. They cannot tell a factory what count to spin from a customer's Tex spec, or check a supplier's figure against the Ne count already agreed. A wrong assumption here is not small: since the two systems run in opposite directions, a mistaken conversion orders a yarn far too fine or far too thick, discovered only once the fabric comes back wrong.
You need: Order A's fixed yarn spec, Ne 30/1 combed cotton, and the idea of a yarn count from lesson 2.1 (natural fibres). Lesson 3.1 (how fibres become yarn) is useful background but not required.
By the end of this lesson you can:
Not covered here: ply and twist, what a construction number such as "30/1" tells you about how a yarn was made (lesson 3.3), combed versus carded yarn (lesson 3.4), and calculating total yarn requirements for an order (lesson 3.5).
| Term | Meaning |
|---|---|
| Yarn count (Ne) | A number describing how fine a yarn is in the English cotton count system. A higher count number means a finer yarn. |
| Tex | A universal yarn-fineness system where a higher number means a thicker yarn, the opposite direction from the Ne system. |
| Combed cotton | Cotton yarn that has been through combing, a step that removes the shortest fibres before spinning, giving a smoother, stronger, more even yarn. |
| Ply | The number of single strands twisted together to make a yarn. "/1" means single-ply: one strand, not twisted with another. |
| Spec (specification) | The written requirements a fibre, yarn or fabric must meet for a given order. |
Different parts of the textile industry, and different countries, historically settled on different ways to number a yarn's fineness. Yarn count (Ne), the English cotton count system, is the system Order A's own spec already uses: Ne 30/1 combed cotton. Tex is a more universal system used across fibre types and in many international specs. The two systems describe the same physical yarn, just running in opposite directions: in Ne, a higher number means a finer yarn; in Tex, a higher number means a thicker yarn. This opposite direction is the single fact that causes the most confusion, and it is exactly why a fixed conversion formula, not a rule of thumb, is needed: Tex = 590.5 / Ne, and, run the other way, Ne = 590.5 / Tex.
| What can differ | The shapes you will meet | Why it matters |
|---|---|---|
| Ne (English cotton count) | Historically specific to cotton spinning; higher number means finer yarn; Order A's Ne 30/1 combed cotton uses this system. | A mill's own internal records for cotton yarn, such as Nile Spinning's, are usually already in Ne. |
| Tex | Used more universally across fibre types, common in international and technical specs; higher number means thicker yarn. | A customer's spec written outside the supplier's usual system often arrives in Tex, not Ne. |
| Export specs from a new customer | A spec from a customer outside the country the mill normally supplies is more likely to be written in Tex or a metric-style system than in Ne. | Sara, buying for export at Northline Apparel, meets Tex specs from new international customers more often than a domestic buyer would. |
| Domestic and repeat-customer specs | A domestic customer or a repeat customer already familiar with a mill's usual system is more likely to keep using Ne, since it is the system already shared between them. | Neither system is "correct" everywhere; the system in use depends on who wrote the spec and where they normally buy. |
| Knit-to-garment, terry and home textiles | These product families also buy yarn by Ne or Tex, and the same opposite-direction confusion applies whenever a spec crosses from one system to the other, whatever the end product. | The conversion formula is not specific to T-shirts; it applies to any yarn count, in any product family. |
Neither system is used everywhere across the trade: a merchandiser converts between them whenever the person giving a spec and the person spinning the yarn are not already using the same one.
The case we followSara, the buyer at Northline Apparel, receives a fabric spec from a new international customer for the first time. Northline and Delta Garments normally describe yarn for Order A-style fabrics in Ne, matching Nile Spinning's own records, Ne 30/1 combed cotton. This new customer's spec is written in Tex instead, the first time Sara has had to convert between the two systems for a real order.
Sara cannot simply hand the Tex number to Delta Garments and Nile Spinning as if it were already an Ne count, since a higher Tex number would be read, wrongly, as a higher Ne number, when the two run in opposite directions. She needs to convert the customer's Tex figure into the Ne count that Delta Garments and Nile Spinning actually work in, using the standard formula, before the spec means anything to the people who will spin the yarn.
The worked numberOrder A's fabric already uses "Ne 30/1 combed cotton" (Order A reference above). Applying the standard formula:
This shows the same physical yarn, Order A's Ne 30/1 combed cotton, expressed in the system a Tex-based spec would use. No new yarn has been chosen; only the number describing the existing one has been converted.
| System | Order A's yarn |
|---|---|
| Ne (English cotton count) | 30/1 |
| Tex (converted) | About 19.7 |
A common mistake is treating a Tex value as if it were an Ne value, or the reverse, without converting at all. Because the two systems count in opposite directions, this mistake does not produce a slightly wrong yarn; it produces a yarn fineness the customer never asked for, in the wrong direction entirely, too fine when they wanted a thick yarn, or too thick when they wanted a fine one. The cost is discovered only once the fabric is spun, knitted and compared against the approved sample, when it is far too late to fix cheaply.
Two different number systems describe how fine or thick a yarn is. In one system, Ne, a bigger number means a thinner, finer yarn. In the other system, Tex, a bigger number means a thicker yarn, the opposite direction. The same yarn can be written correctly in either system, but the numbers themselves are not interchangeable. A fixed calculation turns one into the other: divide 590.5 by the Ne number to get Tex, or divide 590.5 by the Tex number to get Ne. Order A's own yarn, Ne 30, comes out at about 19.7 in the Tex system. Getting the direction wrong, treating a Tex number as if it behaved like an Ne number, orders a yarn far too fine or far too thick, not just slightly off.
Sara, the buyer at Northline Apparel, is preparing to place a new export order:
The document Sara reads, the customer's spec line:
What Ne count should Sara ask Delta Garments to confirm they can spin? Decide before you open the answer.
Ne = 590.5 / Tex = 590.5 / 20 ≈ 29.5, so Sara should ask Delta Garments to confirm they can spin approximately Ne 29 to 30.
The two facts that decide this are the formula, Ne = 590.5 / Tex, run in the direction needed because the spec arrived in Tex, and the value itself, 20 tex, taken directly from the customer's spec line. The converted figure, about Ne 29.5, sits very close to Order A's own Ne 30/1, meaning this is a familiar count for Nile Spinning to spin, even though the customer's spec happened to be written in an unfamiliar system.
Had Sara instead read "20" as if it were already an Ne count, she would have asked Delta Garments to confirm a yarn roughly 50% finer than the 20 tex the customer actually specified, since 20 tex sits near Ne 29 to 30 once correctly converted, not near Ne 20. That mismatch would only surface once the wrong fabric came back against the approved sample.
This risk is framed qualitatively, because no specific order has actually been quoted or produced against the wrong count in this case. Failing to convert a customer's Tex spec into the Ne count the factory actually works in risks the factory quoting, or even spinning, the wrong yarn fineness entirely, since the two systems run in opposite directions rather than differing by a small margin. This is discovered only once the fabric fails to match the approved sample, by which point the yarn has already been spun, the fabric already knitted, and the time and yarn cost already spent. Converting correctly, using the standard formula both ways, is a small step that avoids a mismatch that is expensive precisely because it is caught late.
This course's yarn calculator holds the standard formula-driven calculations this course teaches. The first row is exactly this lesson's calculation: enter an Ne count in the input cell, and the result cell applies Tex = 590.5 / Ne automatically.
| Column | Order A's yarn (filled in) | Your yarn |
|---|---|---|
| Input: Ne count | 30 | |
| Formula | Tex = 590.5 / Ne | Tex = 590.5 / Ne |
| Result: Tex | About 19.7 |
Download the yarn calculator linked from this course, change the yellow input cell to any Ne or Tex count, and the white result cell recalculates automatically.
1. In the Ne system, does a higher number mean a finer or a thicker yarn?
2. In the Tex system, does a higher number mean a finer or a thicker yarn?
3. A supplier's yarn is quoted at 40 tex. Applying Ne = 590.5 / Tex, approximately what Ne count does this correspond to?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Yarn count (Ne) | رقم الغزل (نظام Ne) | Numéro de fil (Ne) | İplik numarası (Ne sistemi) | A number describing how fine a yarn is in the English cotton count system. A higher count number means a finer yarn. |
| Tex | تكس (Tex) | Tex | Teks (Tex) | A universal yarn-fineness system where a higher number means a thicker yarn, the opposite direction from the Ne system. |
| Combed cotton | قطن ممشط | Coton peigné | Taranmış (penyeli) pamuk | Cotton yarn that has been through combing, a step that removes the shortest fibres before spinning, giving a smoother, stronger, more even yarn. |
| Ply | عدد الخيوط (البرم) | Nombre de fils retors (ply) | Kat sayısı (ply) | The number of single strands twisted together to make a yarn. "/1" means single-ply: one strand, not twisted with another. |
| Spec (specification) | المواصفة | Cahier des charges | Şartname | The written requirements a fibre, yarn or fabric must meet for a given order. |
You now know how to convert a yarn count between the Ne and Tex systems. The next lesson looks at another number that describes a yarn: its ply and twist, and what a construction number such as "30/1" actually tells you about how the yarn was made. Back to the course map