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Yarn Count Conversion Worksheet: Ne to Tex, Nm and Denier

Yarn is sold in different count systems depending on the fiber and the country, which makes purchase orders, BOMs and supplier quotes hard to compare. This worksheet converts English cotton count (Ne) into Tex, dtex, Nm and denier, and gives yarn length for the weight you buy.

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Tex (g per 1000 m)	dtex	Metric count Nm	Denier (g per 9000 m)	Length (km)
19.6833	196.8333	50.8044	177.15	101,608.81
29.525	295.25	33.8696	265.725	169,348.01
9.8417	98.4167	101.6088	88.575	81,287.04
59.05	590.5	16.9348	531.45	101,608.81
7.3813	73.8125	135.4784	66.4313	40,643.52

Total quantity (kg)

14,100

Total length (km)

494,496.19

Conversions assume the standard cotton count: Tex = 590.5 / Ne, with Nm = 1000 / Tex and denier = 9 x Tex. Other systems (worsted, linen, woolen) use different constants. Check the count system before ordering.

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How to use it

Type each yarn on a row, enter the Ne count and the quantity in kilograms, and the other systems are calculated automatically. Add rows for each yarn on your BOM, then export to Excel or PDF for a purchase order or tech pack. Overwrite the example rows with your own counts.

Ne and Nm are indirect systems: higher number means finer yarn
Tex and denier are direct systems: higher number means heavier yarn
Ply yarns need the resultant count, so check the supplier's convention

The conversions

Tex is grams per 1000 meters. For cotton counts, Tex = 590.5 / Ne. Nm is meters per gram, so Nm = 1000 / Tex. Denier is grams per 9000 meters, so Denier = 9 x Tex, and dtex is 10 x Tex. Yarn length in kilometers equals kilograms x 1000 / Tex, which is useful when you convert a purchase quantity into knitted or woven length.

Reading the result

A 30 Ne yarn is about 19.7 Tex, roughly 50.8 Nm and about 177 denier. Doubling the Ne halves the Tex. Use the length column to compare supplier quotes per kilogram on yarns of different counts: a finer yarn gives more kilometers per kilogram, so a higher price per kilogram can still be the same cost per kilometer.

Common mistakes

The most frequent mistake is mixing indirect and direct systems, for example expecting a higher Nm to mean a heavier yarn. Others apply the cotton constant to worsted or linen counts, which use other base lengths. Also check whether denier refers to filament yarn, and whether the quoted count is single or plied before conversion.

Frequently Asked Questions

What is the formula to convert Ne to Tex?

For English cotton count the formula is Tex = 590.5 / Ne. For example 20 Ne is 29.5 Tex. Tex is the grams of yarn per 1000 meters, so a heavier yarn has a higher Tex and a lower Ne.

How do I convert Ne to Nm?

Divide 1000 by the Tex, or multiply Ne by about 1.6934. For example 30 Ne is about 50.8 Nm. Nm counts the meters in one gram, so a higher Nm is a finer yarn.

Does this work for polyester or viscose?

Counts are fiber independent once expressed in Tex or denier. If the supplier quotes polyester in denier, enter the Ne equivalent or use the formula backwards. The cotton constant only applies if the count is given as Ne.

How is yarn length calculated?

Length in meters is weight in grams divided by Tex, times 1000. In this sheet the length column is shown in kilometers for a quantity in kilograms. It does not include waste, so keep an allowance when you plan production.

If yarn items and specifications are stored in your ERP with inconsistent units, we can build a read-only assistant that normalizes counts across suppliers and flags BOM mismatches.

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