Yarn Count Systems Explained: Nm, Tex, Denier and Ne

By YZR Sweaters · 2026-09

cream knitted sweater photographed to illustrate yarn count and thickness

Quick answer

Yarn count describes how thick a yarn is, and there are four numbering systems in common use — Nm, tex, denier and Ne. Wool and knitwear generally use Nm (metric count), where a higher number means a finer yarn. Tex and denier measure weight per length, so a higher number means a thicker yarn — the opposite direction. Specifying a count without naming the system is one of the most common causes of a sample arriving in the wrong weight.

A buyer writes "2/28" on a specification and receives a sample that is noticeably heavier than expected. The factory did nothing wrong — it read the number in the system it normally uses, and the buyer wrote it in another. Yarn count is a precise idea wrapped in four different conventions, and the conventions run in opposite directions depending on which one you are in. Getting this straight takes a few minutes and prevents a category of error that is otherwise very hard to diagnose.

Why are there different yarn count systems?

Because different fibre industries developed their own conventions before anyone standardised them. Wool and worsted spinning grew up using metric weight-based counts; cotton used an imperial system based on length; silk and synthetic filaments used a weight-per-fixed-length measure. Each system survived because it suits the trade that uses it.

The result is that a single yarn can carry four different numbers and all of them can be correct. What makes it confusing is that two of the systems increase with fineness while two increase with thickness.

What does each system mean?

The practical distinction is whether the system counts length per unit weight (indirect) or weight per unit length (direct).

Nm (metric count). An indirect system: the number of metres of yarn in one gram. A finer yarn gives a higher Nm, so 2/60 is much finer than 2/20. This is the standard in wool and knitwear — and it is the one your factory is most likely to assume if you simply write a number.
Ne ( cotton count / English count). Also indirect: the number of hanks of a fixed length in one pound. Used mainly for cotton and cotton blends. Higher Ne means finer yarn, but the units are different from Nm, so the numbers are not interchangeable — a 30 Ne yarn is not a 30 Nm yarn.
Tex. A direct system: the weight in grams of 1,000 metres of yarn. A higher tex means a thicker yarn. Used widely in technical textiles and increasingly as a neutral reference because it is direct and unambiguous.
Denier. Also direct: the weight in grams of 9,000 metres. Commonly used for filament yarns and synthetics, and familiar from hosiery. Higher denier means thicker.

The core trap: Nm and Ne rise with fineness, while tex and denier rise with thickness. If someone says "we need a finer yarn, use a higher number" they are correct in Nm and Ne and wrong in tex and denier.

What does the "2/" in 2/28 mean?

Two-ply yarn — written as 2/28 or 2/60 — is spun from two single yarns twisted together. The number after the slash is the count of each single yarn, not of the finished plied yarn. So 2/28 Nm means two strands each of 28 Nm, which results in a finished yarn of about 14 Nm equivalent.

This is where a great deal of confusion lives. A buyer who wants a finished yarn of 28 Nm should specify something closer to 2/56 — not 2/28. The convention is standard in the wool trade, but it is not intuitive, and it is worth writing out explicitly in a specification rather than relying on the shorthand.

How do the systems relate?

Rather than memorising conversion formulas, it is usually enough to understand two things. First, tex and denier are fixed references, so they are the least ambiguous way to state a yarn weight. Second, if you are given a number in one system and need it in another, ask the yarn supplier or mill to state it in tex as well — they will have the figures, and a mill that cannot answer is a mill worth being cautious about.

Where the count genuinely matters is at the boundary with the knitting: a count combined with the machine gauge decides the fabric's character, and getting it wrong shifts the hand feel, the weight and often the price. Our guide to knit gauge covers the machine side, and our notes on fabric weight cover how the finished weight is measured.

Where does the count show up in a knitting specification?

In practice the count appears in three places, and each has its own failure mode:

In the yarn specification. Stating the count and the system together is the single most useful habit — "2/28 Nm" rather than "2/28". It costs four characters and removes the ambiguity.
In the quotation. Yarn price is closely tied to count, so a quote that names the count allows you to compare like with like. Our guide to reading a sweater quotation covers the cost blocks where this matters.
In substitution or sourcing decisions. If a yarn becomes unavailable, a substitute has to match on count as well as fibre, otherwise the garment's weight and hand change. Our notes on yarn substitution explain why that is a formal decision rather than a swap.

What should a buyer actually do?

Always name the system. "30 Nm", "30 tex", "2/28 Nm" — never a bare number.
Write plied counts explicitly rather than using the shorthand alone, particularly the first time you work with a supplier.
Ask for tex as a cross-check when a yarn is new to you, since it is the most directly comparable measure.
Confirm on a swatch. Whatever the numbers say, the swatch is the authority — weight, hand and surface are what you are actually buying.
Keep the count in the tech pack. Our guide to the tech pack covers where yarn details belong in the specification.

At YZR Sweaters we state the count and the system on every yarn specification, give tex equivalents on request, and knit swatches when a count is unfamiliar to either side. We work with partner factories holding BSCI, SEDEX and Oeko-Tex certifications, welcome factory audits, and support both full inspection and third-party inspection through firms such as SGS and BV — and we would rather spend five minutes confirming a count than remake a sample.

Unsure how a yarn count translates into your target weight and hand feel? Send us the yarn details or the reference garment, and we will confirm the count, system and gauge that gets you there.

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Frequently asked questions

Is a higher yarn count better quality?

No — the count describes thickness, not quality. A finer count usually costs more because it requires finer fibre and more spinning, and it gives a lighter, more refined fabric. But a chunky winter sweater needs a coarser yarn by design, and judging it by count would be a mistake. Quality comes from the fibre, spinning and consistency rather than the number.

Why does 2/28 yarn feel like a 14 count?

Because the number describes each of the two plies, not the finished yarn. Two strands of 28 Nm twisted together behave like roughly half that count, so around 14 Nm equivalent. This is standard practice in the wool trade, but it is worth writing out in full on a specification so nobody has to interpret the shorthand.

Which system should I use in a specification?

Whatever the factory normally works in — for wool and knitwear that is usually Nm — but always name the system rather than writing a bare number. Adding the tex equivalent is a useful cross-check for a new yarn, because tex is a direct measure and leaves no room for the rise-with-fineness confusion that Nm and Ne create.