Every fabric spec sheet lists a yarn count, yet buyers routinely misread it. One mill quotes Nm 32/2, another offers Ne 20/1, and a third lists 50 Tex. Without converting to a common basis, comparing them is guesswork. This guide breaks down the three dominant yarn count systems, shows you how to convert between them, and explains which counts suit tweed jackets, overcoats, and knit garments.
The data here comes from 30 years of yarn sourcing at a Wenzhou mill that runs 300+ looms producing tweed, boucle, and knit fabrics. The numbers reflect what actually goes onto production looms, not textbook theory.
What Yarn Count Actually Measures
Yarn count expresses the linear density of a single strand of fiber. It answers one question: how much yarn fits in a given length or weight. A higher count in the indirect systems (Ne, Nm) means a finer yarn. A higher Tex number means a coarser yarn. This inverse relationship is the single biggest source of confusion when buyers compare quotes from mills using different systems.
Two families of systems exist. Indirect systems measure length per unit weight (the count goes up as yarn gets finer). Direct systems measure weight per unit length (the number goes up as yarn gets thicker). Ne and Nm are indirect. Tex is direct.
Ne: The English Cotton Count
Ne (sometimes written NeC to distinguish it from other “Number English” variants) defines how many 840-yard hanks weigh one pound. Ne 1 means 840 yards per pound. Ne 40 means 40 times 840 yards, or 33,600 yards, per pound. The higher the Ne, the finer the yarn.
This system originated in the British cotton industry and remains standard for cotton and cotton-blend yarns. When your woolen or worsted yarn spec references Ne, it typically describes the cotton-type counting even if the fiber is a wool blend. Mills in China, India, and Pakistan default to Ne for commercial yarns.
For tweed and coating fabrics, typical Ne counts range from Ne 8 to Ne 24 for warp yarns and Ne 6 to Ne 16 for weft. A heavy overcoat fabric might use Ne 10/2 (two-ply, each end equivalent to Ne 20 singles). A lightweight Chanel-style tweed for spring jackets could run Ne 16/2 to Ne 20/2.
Nm: The Metric Count
Nm (Number metric) defines how many 1,000-meter hanks weigh one kilogram. Nm 1 equals 1,000 meters per kilogram. Nm 60 equals 60,000 meters per kilogram. Like Ne, higher Nm means finer yarn.
Nm is the default system in continental Europe and for woolen yarns globally. Wool top and woolen spinning mills from Biella to Wenzhou quote Nm as standard. When a tweed fabric weight guide references yarn specifications, Nm is the system you will encounter most often for wool and wool-blend fibers.
Typical Nm counts for tweed: Nm 16/2 to Nm 32/2 for jacket-weight fabrics, Nm 10/2 to Nm 16/2 for overcoats. Boucle yarns used in Chanel-style fabrics often run Nm 8/1 to Nm 14/1 for the effect yarn that creates the loop texture.
Tex: The Direct Counting System
Tex measures grams per 1,000 meters. Tex 1 means 1 gram per 1,000 meters. Tex 50 means 50 grams per 1,000 meters. Unlike Ne and Nm, a higher Tex number means a thicker, heavier yarn. This direct relationship makes Tex more intuitive once you get past the Ne/Nm habit.
Tex is the ISO-standardized system (ISO 2060) and is used increasingly in technical textiles, knit fabrics, and any application where precise mass-per-length matters. For boucle loop engineering, Tex is the preferred unit because the core, effect, and binder yarns in a boucle structure each carry different Tex values that determine loop size and stability.
Typical Tex values: 25-50 Tex for fine suiting yarns, 50-100 Tex for tweed warp, 100-200 Tex for coating and overcoat yarns. Knit fabrics for sweaters often use 30-80 Tex depending on the gauge.
Conversion Formulas Between Ne, Nm, and Tex
Converting between systems requires identifying which fiber you are counting. Ne is based on the 840-yard/lb hank for cotton. Nm uses the 1,000-meter/kg hank. The conversion factor between Ne and Nm for cotton is approximately 1.69 (Nm = Ne x 0.5905, or Ne = Nm x 1.69). For worsted wool, the constant shifts because the worsted Ne uses a 560-yard/lb hank instead of 840.
Here are the practical formulas buyers need:
- Ne (cotton) to Nm: Nm = Ne x 0.5905. Example: Ne 20 cotton = Nm 11.8
- Nm to Ne (cotton): Ne = Nm x 1.69. Example: Nm 32 = Ne 54
- Nm to Tex: Tex = 1,000 / Nm (for singles). Example: Nm 50 = Tex 20
- Tex to Nm: Nm = 1,000 / Tex. Example: Tex 25 = Nm 40
- Ne (cotton) to Tex: Tex = 590.5 / Ne. Example: Ne 20 = Tex 29.5
- Tex to Ne (cotton): Ne = 590.5 / Tex. Example: Tex 30 = Ne 19.7
For worsted yarns, replace 590.5 with 337.5 in the Ne-to-Tex formulas because the worsted hank is 560 yards, not 840. This is the conversion error that causes the most confusion: applying the cotton constant to a worsted count. A mill quoting “Ne 30 worsted” is not the same yarn as “Ne 30 cotton.” The worsted version is Tex 11.25; the cotton version is Tex 19.7. That is a 75% difference in linear density.
Yarn Count Ranges for Common Tweed and Knit Applications
Different garments demand different yarn counts. Here are the ranges seen in production at a 300-loom Wenzhou mill, covering tweed jackets, overcoats, and knit sweaters:
- Chanel-style tweed jackets (300-380 GSM): Warp Nm 28/2 to 32/2, weft Nm 16/1 to 20/1, boucle effect yarn Nm 8/1 to 12/1
- Classic tweed suits (380-450 GSM): Warp Nm 24/2 to 28/2, weft Nm 16/2 to 20/2
- Woolen overcoats (500-800 GSM): Warp Nm 16/2 to 20/2, weft Nm 10/2 to 14/2
- Fashion sweater knits: 30-80 Tex depending on gauge, with cable knits at the heavier end (60-80 Tex) and fine-gauge jerseys at 30-40 Tex
These ranges are not arbitrary. They result from the interplay between yarn count, fabric weight (GSM), and loom settings. A 300-GSM tweed jacket fabric cannot be woven with Nm 10 yarns; the result would be too heavy and too open. The count must match the target weight. The GSM to oz/yd² conversion guide on this site covers the weight side of that equation.
When you are ready to spec a count for a production run, request a quote with your target weight, width, and fiber blend, and the mill will confirm the yarn count before sampling.
How to Read a Mill Spec Sheet Without Errors
When a mill sends a yarn spec or fabric data sheet, the count notation follows a standard format. “Nm 32/2” means metric count 32, two-ply. The singles count is 32; plying two ends together yields an effective count of Nm 16 (half the singles number for a balanced ply). Similarly, “Ne 20/3” means three-ply cotton count 20, yielding an effective Ne 6.67.
Common mistakes buyers make when reading spec sheets:
- Assuming “Ne” always means cotton count. Some European mills use Ne to mean “Number English” for worsted (560-yard hank). Always confirm which hank length.
- Ignoring the ply suffix. “/2” and “/3” change the effective count dramatically. Nm 32/2 is not the same yarn as Nm 32/1.
- Comparing Tex to Ne without converting. A mill quoting Tex 40 and another quoting Ne 20 are offering similar yarns (Ne 20 cotton = Tex 29.5), but the difference matters for fabric hand and drape.
Den RFQ template for tweed and knit fabric on this site includes a field for yarn count with system designation. Filling it correctly prevents the back-and-forth that delays sampling by days. For additional context on how international standards define these counting systems, yarn count numbering and conversion guides provide useful reference tables that cross-reference Ne, Nm, and Tex across fiber types.
Why Yarn Count Matters for Cost
Yarn count directly determines raw material consumption. A Nm 32 yarn uses twice as much fiber per meter as a Nm 16 yarn. When wool prices run 8-12 USD per kilogram for apparel-grade merino, the difference between specifying Nm 20 and Nm 30 for a weft yarn translates to 15-25% more fiber cost per meter of fabric.
Finer counts also cost more to spin. The spinning process for Nm 50 requires more drafting passes, tighter twist control, and slower spindle speeds than Nm 20. Spinning cost for Nm 50 can be 40-60% higher than Nm 20 for the same fiber. This is why a 380-GSM tweed woven with Nm 28 yarns costs more than a 500-GSM overcoat woven with Nm 14 yarns, even though the overcoat is heavier. The finer yarn drives the cost, not the weight.
When evaluating yarn-dyed versus piece-dyed tweed, yarn count also affects dye uptake. Finer yarns absorb dye more quickly but show shade variation more readily. This interaction between count, dye method, and visual consistency is a key reason bulk color matching fails when the yarn count specification is loose.
Slutsats
Yarn count is the foundation of every fabric specification. Ne, Nm, and Tex are three ways of saying the same thing: how thick is this yarn. The system you use depends on your fiber (cotton defaults to Ne, wool to Nm, technical textiles to Tex) and your market. Converting between them requires the right constant, and confusing cotton Ne with worsted Ne is the most expensive mistake a buyer can make.
When you receive a mill spec sheet, check three things: the counting system (Ne, Nm, or Tex), the ply designation (/2, /3), and whether the hank length matches the fiber type. Get those right, and the rest of the fabric specification, from GSM to cost per meter, follows logically.
What is the difference between Ne and Nm yarn count?
Ne (English Cotton Count) uses 840-yard hanks per pound. Nm (Metric Count) uses 1,000-meter hanks per kilogram. Both are indirect systems where higher numbers mean finer yarn. Convert with Nm = Ne x 0.5905 for cotton.
What yarn count is best for tweed fabric?
Tweed jackets (380-450 GSM) typically use Nm 24/2 to 32/2 for warp and Nm 16/2 to 20/2 for weft. Overcoats (500-800 GSM) use heavier yarns in the Nm 10/2 to 20/2 range. The count must match the target fabric weight.
How do you convert Tex to Ne?
For cotton: Ne = 590.5 / Tex. For worsted wool: Ne = 337.5 / Tex. A Tex 30 cotton yarn converts to Ne 19.7, while the same Tex 30 worsted converts to Ne 11.25. Using the wrong constant is a common and costly error.
Why does yarn count affect fabric cost?
Finer yarns consume more fiber per meter and cost more to spin. A Nm 50 yarn can cost 40-60% more to spin than Nm 20 from the same fiber. This is why lightweight fine-count tweeds often cost more per meter than heavier coarse-count overcoats.
What does the “/2” mean in yarn count notation?
The “/2” indicates two-ply construction: two single yarns twisted together. “Nm 32/2” means each single is Nm 32, and plying two together yields an effective count of Nm 16. The ply number changes the yarn thickness and must be included in any comparison.
For the construction-level detail, see our flat knit vs circular knit machine guide.
