What Does Ne 40 Mean? Cotton Yarn Counts Explained
Cotton shirts and sheets are sold with numbers like "40s", "80s two-ply" and "Ne 100". They are cotton yarn counts, and they describe how fine the yarn is. A higher number means a finer yarn, which is the opposite of the denier figure on a pair of tights, and that reversal is the source of most confusion. This guide explains what a count like Ne 40 actually measures, how it converts to tex and denier with the yarn count converter, what two-ply notation means, and how the count combines with ends and picks per inch in the Thread Count & Cover Factor Calculator to describe a real shirting or sheeting fabric.
What Ne measures
Ne is the English cotton count. It is the number of hanks of yarn, each 840 yards long, that together weigh one pound. A yarn is Ne 40 if forty of those hanks, 33,600 yards in all, weigh a pound. The finer the yarn, the more length you get from a pound, so the count goes up as the yarn gets thinner.
That makes Ne an indirect count, like the metric count Nm, which is kilometres per kilogram. Tex, dtex and denier are direct counts, where a larger number means a heavier yarn. Converting between them goes through tex:
tex ≈ 590.5 ÷ Ne
Common cotton counts converted
Each row below was found by working out the tex from the Ne figure and entering it into the converter, which returns the Ne as a check.
| Cotton count | Tex | Denier | Nm | Typical use |
|---|---|---|---|---|
| Ne 10 | 59.05 | 531.45 | 16.93 | Denim, canvas, heavy twill |
| Ne 20 | 29.53 | 265.72 | 33.87 | Drill, heavier sheeting, sweatshirt yarns |
| Ne 30 | 19.68 | 177.15 | 50.8 | Jersey, everyday sheeting, chino |
| Ne 40 | 14.76 | 132.86 | 67.74 | Poplin, good-quality shirting and sheeting |
| Ne 60 | 9.84 | 88.58 | 101.61 | Fine shirting, lawn |
| Ne 80 | 7.38 | 66.43 | 135.48 | Fine dress shirting, voile |
The "typical use" column is a loose guide; mills use a wide spread of counts for each kind of cloth. What the table does show is how quickly the yarn gets lighter: an Ne 80 yarn has half the mass per metre of an Ne 40, and an eighth of an Ne 10.
Two-ply: what "2/80s" and "80/2" mean
Fine shirtings are often woven from two-ply yarns: two single yarns twisted together. In the cotton trade the notation is usually written 2/80s or 80/2, and it means two singles of Ne 80 twisted together. The resulting yarn weighs about twice as much per metre as one single, so its resultant count is close to Ne 40.
A two-ply yarn of a given resultant count is generally stronger, smoother and more even than a single yarn of the same count, because twisting two yarns together evens out thick and thin places. That is why a "2/80s" shirt can feel finer than a "40s" shirt even though the yarns weigh roughly the same per metre. When a fabric is described as "two-fold" or "2x2 ply", both the warp and the weft are plied.
When you enter a plied yarn into the thread count calculator, use the resultant count (about Ne 40 for 2/80s), not the singles count. Entering 80 would describe a yarn half as heavy as the one in the cloth and understate the cover.
Count and construction together: a poplin example
A widely used poplin construction is written 40 x 40 / 133 x 72. That means warp and weft are both Ne 40, with 133 ends per inch in the warp and 72 picks per inch in the weft. Entering it in the thread count calculator gives:
- Thread count: 205
- Warp : weft balance: 1.85:1, the warp-heavy balance that gives poplin its fine horizontal rib
- Warp cover K1: 21.03; weft cover K2: 11.38
- Cloth cover factor: 23.86
A denser variant at 144 x 76 with the same yarns rises to a thread count of 220 and a cloth cover of 25.01. On the calculator's scale, 28 is full cover, the point at which round yarns would lie side by side with no gap, so both poplins are fairly closely woven, and the second is closer.
Finer yarn at the same thread count
Here is a comparison that surprises people. Take a 200 thread count cloth with 100 ends and 100 picks per inch:
- woven from Ne 30 yarn, the cloth cover factor is 24.61;
- woven from Ne 40 yarn, it is 22.69.
The finer yarn gives a more open cloth at the same thread count, because each thread covers less width. To keep the same cover with finer yarn, the mill has to weave more threads per inch. That is the honest reason fine-count sheets and shirts tend to come with higher thread counts: the count and the density rise together. A high thread count with coarse yarn is often impossible to weave without crushing the yarns, which is one of the ways inflated thread counts give themselves away. The guide to what thread count means for sheets covers that in more detail.
What the count tells you about a fabric
- Weight. For a given construction, a finer count makes a lighter cloth. Shirtings woven from Ne 80 or finer are noticeably lighter than Ne 40 poplins.
- Hand. Finer yarns usually feel smoother and softer, especially when spun from long-staple cotton and combed.
- Durability. Very fine single yarns are weaker; fine shirtings rely on two-ply yarns and dense construction for strength. A heavier yarn usually wears longer in hard use.
- Price. Fine counts need longer, more expensive fibre and slower spinning, so they cost more.
The count says nothing about fibre quality on its own. A fine count spun from short-staple cotton may be weaker and hairier than a slightly coarser count spun from long-staple combed cotton. Terms like "combed", "compact spun" and the cotton variety tell you about that.
Checking a supplier's yarn spec
Suppliers quote yarns in whatever system their market uses. A European mill may describe a shirting yarn as 14.8 tex or 148 dtex; an Indian or Pakistani spinner will describe the same yarn as Ne 40. Enter the tex or dtex in the converter and read the Ne, or work the Ne back to tex with 590.5 ÷ Ne. If a spec mixes systems for warp and weft, convert both to the same one before comparing.
For blended yarns, such as polyester-cotton, the cotton count is still commonly used, but synthetic content changes how fine a given count feels and how the cloth behaves in the wash. Check the blend ratio as well as the count.
Measuring the count of a yarn you have
With an accurate scale you can estimate a yarn's count: unravel a long length, measure it under light tension, weigh it, and work out tex as grams per kilometre. Ten metres of Ne 40 yarn should weigh about 0.15 g, which is too light for most household scales to measure accurately, so use longer lengths or several lengths together. Yarn taken from a woven fabric is crimped from going over and under the other threads; straighten it gently before measuring.
Limits of the tools
The yarn count converter takes tex, dtex or denier as input and reports Ne and Nm; for a cotton count you must convert to tex yourself first, as shown above. It does not calculate plied resultants. The thread count calculator uses Peirce's cover factor formula in the cotton system, which is a good guide to how closely a plain or simple twill weave is set; it does not model long floats in sateens and satins, yarn flattening, or finishing. For a fabric bought to a contract specification, a textile laboratory can measure yarn counts and threads per inch to a standard method.