What Does Nm Mean in Yarn and How Do You Read Yarn Count?

Yarn count is the single most important technical specification in a worsted yarn inquiry. It determines the yarn's thickness, the fabric's weight and density, the needle gauge required for knitting or the reed specification required for weaving, and ultimately the hand feel, drape, and performance of the finished garment or fabric. Yet yarn count notation is one of the most frequently misunderstood aspects of textile sourcing for buyers who are new to the worsted yarn category — in part because different count systems (Nm, Ne, Tex, and others) are used in different markets and production contexts. The same yarn can be described very differently depending on the system used.

For brands, designers, product developers, and procurement managers sourcing worsted yarn — whether wool yarn, cashmere yarn, or blended yarn — for knitwear, woven fabrics, or other textile applications, this guide explains what yarn count means in practical terms, how to read and convert between the main count systems used in worsted yarn, how to interpret a yarn specification sheet, and how to use count information to compare suppliers effectively.

What Does Yarn Count Measure?

Yarn count is a measure of a yarn's linear density — the relationship between the yarn's length and its weight. A yarn count number tells you, in various ways depending on the system, how fine or how thick the yarn is. This matters commercially because:

Finer yarns (higher Nm numbers) produce lighter, more fluid fabrics with a finer surface texture, and are associated with premium quality and luxury positioning — superfine merino knitwear, lightweight cashmere sweaters, and fine worsted suiting all use high-count yarns. Coarser yarns (lower Nm numbers) produce heavier, bulkier fabrics with a more pronounced texture, and are associated with chunky knitwear, outerwear, and heavier-weight fabrics. The count of the yarn you specify directly determines which knitting gauge, weaving specifications, and finishing processes are appropriate — buying a yarn at the wrong count for your intended machine gauge is a practical production problem that will result in either an impossible-to-knit yarn or a fabric with the wrong weight and structure.

The Nm System: The Standard for Worsted Yarn

Nm stands for "metric count" (also written as Nm or Nm count, from the French "numéro métrique"). It is the primary yarn count system used in worsted spinning — including wool yarn, cashmere yarn, and worsted-spun blended yarn — in continental Europe, China, and the majority of international B2B worsted yarn trade. Understanding Nm is the foundation of reading any worsted yarn supplier's specification sheet.

Definition of Nm: Nm is the number of meters of yarn that weighs one gram. A yarn designated as Nm 30 means that 30 meters of that yarn weighs 1 gram. A yarn designated as Nm 60 means that 60 meters weigh 1 gram. The higher the Nm number, the finer the yarn — more meters per gram means each meter weighs less, meaning the yarn is thinner. This is an "indirect" count system — higher number = finer yarn.

The formula is simple:

Nm = Length (meters) ÷ Weight (grams)

Or equivalently: if you have 1,000 meters of yarn and it weighs 25 grams, the Nm count is 1,000 ÷ 25 = Nm 40.

Ply Notation: Single and Folded Yarns

Most worsted yarns used in knitwear and fabric production are not single-ply but folded (plied) — two or more single yarns are twisted together to form the final yarn. The ply count significantly affects the yarn's practical properties and must be specified alongside the Nm count. The standard notation for a folded yarn in the Nm system is:

Nm [count of single strand] / [number of plies]

For example:

• Nm 28/2 — a 2-ply yarn where every single strand is Nm 28. The folded yarn's effective count is Nm 14 (28 ÷ 2 = 14). This is a relatively heavy-weight worsted yarn suitable for chunky knitwear, heavy outerwear, or coarse woolen fabrics.
• Nm 60/2 — a 2-ply yarn where every single strand is Nm 60. The folded yarn's effective count is Nm 30. A medium-weight worsted yarn widely used in standard knitwear (flatbed and circular knitting) and light-to-mid weight fabrics.
• Nm 120/2 — a 2-ply yarn where every single strand is Nm 120. Effective count Nm 60. A fine worsted yarn for lightweight knitwear, fine gauge flatbed machine knitting, and light suiting fabrics. Cashmere and superfine merino yarns are frequently produced at Nm 120/2 or finer.
• Nm 60/3 — a 3-ply yarn where every single strand is Nm 60. Effective count Nm 20. Heavier than Nm 60/2; the 3-ply structure gives the yarn a rounder cross-section and typically better abrasion resistance than a 2-ply at equivalent effective count.

Important: When a supplier quotes "Nm 28/2," the 28 refers to the single strand count, not the final folded yarn count. The effective (finished) yarn count is 28 ÷ 2 = Nm 14. Always clarify with the supplier whether the quoted count refers to the single strand or the final folded yarn — different suppliers use different conventions in quotation, and this is a common source of specification confusion that leads to receiving yarn of a different weight than intended.

Nm Count Ranges for Common Worsted Yarn Applications

Converting Between Nm and Other Count Systems

The Ne (English count) system is widely used in the United States and UK for cotton and cotton-type yarns, and you will encounter it in some yarn supplier quotations or fabric specifications. Ne uses the number of 840-yard hanks per pound as its unit. The conversion between Nm and Ne for worsted-type yarns is:

Ne = Nm × 0.5905    (or approximately: Ne ≈ Nm × 0.59)

Nm = Ne × 1.693    (or approximately: Nm ≈ Ne × 1.7)

So a yarn specified as Nm 30 in the metric system is approximately Ne 18 in the English system — a medium-weight worsted yarn suitable for standard knitwear.

The Tex system (used in some technical and academic contexts) measures weight in grams per 1,000 meters — the inverse of Nm. The conversion is:

Tex = 1,000 ÷ Nm

So Nm 40 = 1,000 ÷ 40 = 25 Tex.

Dtex (decitex) = Tex × 10, used for filament and finer fiber specifications. Worsted spun yarns are rarely specified in dtex — this unit is more common in filament yarn and fine fiber contexts.

How to Read a Worsted Yarn Specification Sheet

A standard worsted yarn supplier's product specification sheet (also called a yarn data sheet or tech pack) typically includes the following key fields:

Yarn count: Specified in Nm (metric count) with ply notation, e.g., "Nm 48/2" or "2/48 Nm" (both notations mean the same thing — a 2-ply yarn with every single strand at Nm 48). Confirm whether the count stated is for the single or the folded yarn.

Fiber content: Stated as a percentage of each fiber component, e.g., "80% Superfine Merino Wool / 20% Cashmere" or "50% Wool / 30% Acrylic / 20% Nylon." For natural fiber content claims (especially cashmere), request the fiber content test certificate (IWTO test method or equivalent) from an accredited laboratory to verify the stated content and fiber micron specification.

Twist direction and twist per meter (TPM): S-twist or Z-twist for single yarns; the ply twist direction is normally opposite to the single yarn twist. Twist per meter affects yarn handle (higher twist = firmer, harder hand; lower twist = softer, more open hand) and should be matched to the end application's requirements.

CV% (Coefficient of Variation of count): A measure of count consistency along the yarn's length. Lower CV% indicates more consistent yarn thickness — important for uniform fabric appearance, especially in fine-gauge and luxury knitwear applications. Ask for evenness test data (Uster statistics or equivalent) from suppliers for critical applications.

Breaking strength and elongation: Tensile properties of the yarn, relevant for assessing whether the yarn can withstand the mechanical tensions of industrial knitting or weaving without breakage. High-strength worsted yarns are engineered to exceed standard breaking strength targets for demanding knitting machine conditions.

Yarn weight per cone / per spool: Important for production planning. Standard worsted yarn cones for industrial knitting are typically 500g or 1kg per cone. Hand-knitting yarn is commonly sold in 50g or 100g balls.

How to Use Count Information to Compare Suppliers

When requesting quotations from multiple worsted yarn suppliers for the same specification, the yarn count comparison must be verified carefully to ensure you are genuinely comparing equivalent products. Key steps:

Verify whether the quoted Nm count refers to single or folded yarn. A supplier quoting "Nm 60" could mean either a single strand at Nm 60 (quite fine) or a 2-ply folded yarn at an effective count of Nm 30 (medium weight). Always ask: "Is the stated count the single strand count or the final folded yarn count?" and request confirmation of the ply number separately.

Verify fiber content with test certificates, not just declarations. For cashmere and superfine merino blends, fiber content has a large impact on yarn cost and performance. A specification of "30% cashmere / 70% merino" and "20% cashmere / 80% merino" will produce yarns of noticeably different softness and price, and the difference is not always apparent from visual or tactile inspection of yarn samples alone. Request IWTO fiber analysis test reports from suppliers when comparing high-value natural fiber blends.

Request knitted swatch samples at your target gauge, not just yarn samples. A yarn sample in the hand tells you color, approximate weight, and surface texture, but the fabric performance — pilling resistance, stitch definition, fabric hand, and shrinkage behavior — can only be properly evaluated in a knitted swatch. Before committing to a bulk order from a new worsted yarn supplier, always request yarn samples and knit test swatches at your production machine gauge to evaluate actual fabric performance.

Frequently Asked Questions

What Nm count should I specify for a standard merino sweater?

The most common count range for standard adult knitwear (mid-gauge flatbed knitting, 12–14 GG) is Nm 28/2 to Nm 48/2 (effective count Nm 14 to Nm 24). For fine-gauge luxury merino knitwear (16 GG and above), Nm 60/2 to Nm 120/2 (effective count Nm 30–60) is typical. For chunky, low-gauge knitwear (5–7 GG), Nm 20/2 or Nm 28/2 (effective count Nm 10–14) is appropriate. The exact count needed for your product depends on your target machine gauge, fabric weight specification, and fiber content — consult with your yarn supplier or knitting mill for the most appropriate count recommendation for your specific project.

Is a higher Nm count always better quality?

No. Higher Nm count means finer yarn, but finer is not inherently better — it means different. Fine yarns are required for lightweight, fine-gauge luxury knitwear and suiting fabrics; coarser yarns are required for chunky knitwear and heavy fabrics. The "right" count is the count that matches your product's weight, gauge, and performance requirements. Quality is determined by spinning consistency (CV%), fiber specification, and production process — a coarser Nm 20/2 yarn can be of higher quality than a finer Nm 80/2 yarn if the former has better evenness, strength, and fiber specification.

What is the relationship between yarn count and fabric weight (g/m²)?

Yarn count is one input in determining fabric weight, but not the only one. Fabric weight also depends on the stitch density (courses per cm × wales per cm in knit, or threads per cm in woven), the fabric structure (stitch type, weave structure), and the finishing process (relaxation, compaction, fulling). As a general guide, finer count yarns at equivalent stitch density produce lighter-weight fabrics; coarser count yarns produce heavier fabrics. Your knitting mill or weaving partner can calculate the target fabric weight from your yarn count, stitch density specification, and machine gauge using standard textile engineering formulas.

Worsted Yarn from Jiangsu Haoye Fiber Technology

Jiangsu Haoye Fiber Technology Co., Ltd., Jiangyin, Jiangsu, produces worsted yarn across a full count range — from chunky knitting weights to fine superfine merino and cashmere counts — in single, 2-ply, and 3-ply constructions. Product lines include Wool Yarn (superfine merino, RWS certified, Non-Mulesed available), Cashmere Yarn (high-grade cashmere in multiple count ranges), and Blended Yarn (wool-cashmere, wool-silk, wool-linen, wool-COOLMAX, Tencel-wool-acrylic, and other fiber combinations). Yarn count range: Nm 20/2 to Nm 160/2 (effective Nm 10 to Nm 80+) depending on fiber content and specification. OEKO-TEX certified production. Fiber content test certificates available on request. Stock yarns available in standard colors; custom color cards and custom specifications for confirmed bulk orders. Minimum order quantities vary by count and fiber content — contact us for details.

Contact us with your target Nm count, fiber content, ply specification, and end-use application to receive specifications, test data, and yarn samples.

Related Products: Wool Yarn | Cashmere Yarn | Blended Yarn | Worsted Yarn | Fancy Yarn