Yarn is a long continuous length of interlocked fibres, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, and ropemaking.

l/m = 1693 × lm/Nec × m/kg, where l/m is the yarn length in meters, lm/Nec is the English cotton count and m/kg is the yarn weight in kilograms.

English cotton count (Nec) is an indirect counting system, that is, the higher the number the finer the yarn.

  • Thread: a length of 54 inches (1.4 m) (the circumference of a warp beam)
  • Bundle: usually 10 pounds (4.5 kg)
  • Lea: a length of 80 threads or 120 yards (110 m)

To convert denier to cotton count: lm/Nec = 5315/ρ/den, where lm/Nec is the cotton count and ρ/den is the density in denier.

To convert tex to cotton count: lm/Nec = 590.5/ρ/tex, where lm/Nec is the cotton count and ρ/tex is the density in tex.

Below is another look at the formulas above that we saved into a different format because we are having difficulty typing to show division line.

Yarn Length Formulas

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Have you ever asked yourself, what is a hank of cotton or silk?  You can read the hank definition if you are curious.