Yarn Count | Thread Numbering System | Count Conversion Laws

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Count: Yarns  as well as threads are expressed using number to specify them. Yarn count refers to the thickness of a yarn and is determined by its mass per unit length or length per unit mass. It is important to know various numbering systems and their relationships in understanding yarn and thread size specifications. Yarn counting system is of two types. They are -

Direct Counting System (Length fixed but weight variable):

• Tex 
• Denier
• Jute Count

Indirect Counting System (Weight fixed but length variable):

• English
• Metric
• Worsted

Tex: The yarn number or count in the Tex system is the weight in grams of 1000m or 1 km of yarn.

Denier: The yarn count in the denier system is the weight in grams of 9000m or 9 km of yarn.

Pounds per Spyndle: The yarn count in pounds per spindle is the weight in pounds of 14,400yards of yarn. This counting system is commonly known as jute count.

English: It is defined as the number of hanks (840 yards) per pounds. It is denoted by Ne.

Metric: It is defined as the number of hanks (1000 m) per kg. It is defined by Nm.

Worsted: It is defined as the number of hanks (560 yards) per pounds.

Lea Count  = 48/ (Pounds/Spyndle)

Usually, Metric count is used to describe synthetic, spun and corespun yarn and  thread while English count is used to specify cotton yarn and thread. Filament or spandex yarn and threads are normally expressed with Decitex or Denier.

As these counts are used frequently therefore see the below table for better understanding

Count Conversion Laws:

Using the table below will enable you to perform a simple conversion from one system to another.