Thread Number Conversion: Methods & Calculation

Thread Number Conversion Chart in

Thread Number Conversion Formula

The thread number (count) conversion between different systems can be done using the following general formula:

Thread number conversion refers to changing yarn count values from one system to another. Yarn count determines the thickness of a thread or yarn and is expressed in different units based on regional and industry standards. Common yarn count systems include English Cotton Count (Ne), Tex, Denier, and Metric Count (Nm). Accurate conversion is essential in textile manufacturing, weaving, knitting, and quality control to ensure consistency in fabric production.

Why Is Thread Number Conversion Important?

Different regions and industries use different yarn numbering systems. A European textile manufacturer may use Tex, while a factory in Bangladesh or India may prefer Ne (English Cotton Count). Proper conversion ensures:

• Accurate yarn selection for weaving and knitting.
• Standardization across different suppliers and manufacturers.
• Consistent fabric quality across different production units.
• Smooth global trade between textile producers and buyers.

Common Yarn Count Systems

Yarn count systems are classified into direct and indirect methods based on how they measure the yarn’s thickness.

Indirect Count System (Higher Number = Finer Yarn)

In this system, the yarn count increases as the yarn gets finer. It is based on the length of yarn per unit weight.

• Ne (English Cotton Count) – Number of 840-yard hanks per pound of yarn.
• Nm (Metric Count) – Number of 1,000-meter hanks per kilogram of yarn.
• Worsted Count (NeW) – Number of 560-yard hanks per pound of yarn.

Direct Count System (Higher Number = Thicker Yarn)

In this system, the count increases as the yarn gets thicker. It is based on the weight of yarn per unit length.

• Tex – Weight in grams per 1,000 meters of yarn.
• Denier – Weight in grams per 9,000 meters of yarn.
• Decitex (dTex) – Weight in grams per 10,000 meters of yarn.

How to Convert Between Different Thread Numbers?

Yarn count conversion follows specific formulas. Below are the most commonly used conversion formulas:

Converting Ne to Tex

Converting Tex to Ne

Converting Denier to Tex

Converting Tex to Denier

Converting Ne to Nm

Converting Nm to Ne

Step-by-Step Yarn Count Conversion Examples

Example 1 – Convert 30 Ne to Tex

Using the formula:

So, 30 Ne = 19.68 Tex.

Example 2 – Convert 75 Denier to Tex

Using the formula:

So, 75 Denier = 8.33 Tex.

Example 3 – Convert 40 Nm to Ne

Using the formula:

So, 40 Nm = 23.63 Ne.

Best Practices for Accurate Thread Number Conversion

Use Reliable Conversion Tables

Textile engineers and manufacturers should keep yarn count conversion charts handy to avoid calculation errors.

Use Digital Calculators

Online thread number conversion calculators simplify calculations and reduce errors.

Verify with Physical Yarn Samples

Before large-scale production, compare converted yarn counts with actual yarn samples to confirm consistency.

Consider Fiber Type

Different fibers like cotton, polyester, and wool, may have slight variations in count measurement. Always check the specifications.

Standardize Across Production Units

Ensure all departments in a textile mill use the same counting system to avoid fabric inconsistencies.

Common Mistakes in Thread Number Conversion

Using the Wrong Formula

Applying direct count formulas to indirect count systems leads to incorrect results. Always match the formula to the count system.

Rounding Off Too Early

Avoid rounding off values in mid-calculations as it may lead to errors in large-scale production.

Ignoring Decimal Points

Yarn count values often have decimal places that affect accuracy. Always keep at least two decimal places in conversions.

Not Considering Yarn Blend Ratios

Blended yarns (e.g., cotton-polyester) may require separate conversion factors depending on the fiber ratio.

Conclusion

Thread number conversion is an essential part of textile manufacturing. It helps standardize yarn selection across different regions, mills, and production units. By using accurate formulas, reliable calculators, and verification methods, textile professionals can ensure fabric quality and production efficiency.