Yarn numbering systems and Conversion Table

Tex-System
Swicofil indicates the counts of their yarns by means of the Tex-system.
Tex Units
Term	Definition
Basic Tex Unit [tex]	Mass of yarn in grams per 1000 meters length
Decimal fraction	Mass of yarn in grams per 10'000 meters length
Decitex [dtex]	1 g / 10'000 m = 1/10 tex Decitex is the count grading for filament and spinning yarns recognized by all international bodies in the man-made fibres industry.
Decimal multiple	Mass in kilograms per 1000 meters length.
Kilotex [ktex]	1 kg / 1000 m = 1000 tex) Kilotex is used to state the counts of spinning tow and similar semi-finished and finished products.
Other numbering Systems
Count denier [den]	Mass of yarn in grams for length of 9000 meters
Metric yarns number [Nm]	Length in meters per 1 gram of mass
English cotton yarn number [Ne or ECC)]	Number of 840 yards strands per 1 English pound of mass
Wool runs	Number of 1600 yards strands per 1 English pound of mass
Wool, worsted (NeK)	Number of 560 yards strands per 1 English pound of mass
Wool, woolen measure (NeS)	Number of 256 yards strands per 1 English pound of mass
Linen Count (NeL or Lea)	Number of 300 yards strands per 1 English pound of mass
Spun Silk	Number of 840 yards strands per 1 English pound of mass
Conversion Formulas for the various numbering systems

convert into known	tex	decitex (dtex)	denier (den)	Metric No. (Nm)	English Cotton No. (Ne)
tex		10 x tex	9 x tex	1000 tex	591 tex
decitex (dtex)	dtex 10		0.9 x dtex	10000 dtex	5910 dtex
denier (den)	den 9	den 0.9		9000 den	5314 den
Metric No. (Nm)	1000 Nm	10000 Nm	9000 Nm		0.59 x Nm
English Cotton No. (Ne)	591 Ne	5910 Ne	5314 Ne	Ne x 1.69