Yarn count is the single number that tells you how fine or coarse a yarn is — and it sits behind almost every buying decision in spinning, knitting and weaving. Yet the same yarn can be quoted in four different systems depending on who you talk to. This guide explains Ne, Nm, Tex and Denier in plain terms, shows how they relate, and gives you a fast way to convert between them.
What yarn count actually measures
Count expresses the relationship between a yarn’s length and its weight. There are two families. Indirect systems measure length per unit weight, so a higher number means a finer yarn. Direct systems measure weight per unit length, so a higher number means a coarser yarn. Getting these two families straight is most of the battle.
Indirect systems: Ne and Nm
Ne (English cotton count) is the number of 840-yard hanks in one pound. A 30s cotton yarn (30 Ne) has thirty 840-yard hanks per pound. It is the standard for cotton in India and much of the world.
Nm (metric count) is the number of 1,000-metre lengths per kilogram. It is common for blended, woollen and worsted yarns. Because both Ne and Nm are indirect, a 40s yarn is finer than a 20s in either system.
Direct systems: Tex and Denier
Tex is the weight in grams of 1,000 metres of yarn. Denier is the weight in grams of 9,000 metres, and is used mostly for filament and synthetic yarns. In both, a bigger number is a heavier, coarser yarn.
How to convert between systems
The core relationships, all routed through Tex, are:
- Tex = 590.5 ÷ Ne
- Tex = 1000 ÷ Nm
- Tex = Denier ÷ 9
- Ne = 590.5 ÷ Tex · Nm = 1000 ÷ Tex · Denier = Tex × 9
Rather than do this by hand for every quote, you can drop a value into our free Yarn Count Converter and read Ne, Nm, Tex and Denier side by side.
Worked example
| System | Value for a 30s cotton yarn |
|---|---|
| Ne | 30 |
| Tex | 590.5 ÷ 30 ≈ 19.7 |
| Nm | 1000 ÷ 19.7 ≈ 50.8 |
| Denier | 19.7 × 9 ≈ 177 |
Why count matters when you buy
Count drives fabric weight, hand-feel, strength and price. Finer counts (higher Ne) cost more per kilo, knit and weave into lighter fabric, and demand better fibre. Coarser counts are cheaper and more robust. Matching count to end use — hosiery, shirting, denim or home textiles — is the difference between a fabric that performs and one that disappoints.
Looking for a specific count in cotton or a blend?
More buyer tools: Yarn count converter, length converter and others on our tools page.