The textile industry has a long history and there are various units in use. Common ways to describe the lineal density of a textile are;

Tex (tex)Grams per 1,000 meters of yarn. Tex is a direct measure of linear density.

Deci-tex (dtex) – Grams per 10,000 meters of yarn. Dtex is a direct measure of linear density

Denier (den)Grams per 9,000 meters of yarn. Denier is a direct measure of linear density

Yield – Similar to tex and denier, yield is a term that helps describe the linear density. However, unlike tex and denier, yield is the inverse of linear density and is usually expressed in yards per pound (yd/lb).

### Yield – Lineal Density Conversion

US Units Metric to US Units
Denier = 4,464,492 ÷ (yds/lb) Yield (yds/lb) = 4,464,492 ÷ Denier
TEX = 496,055 ÷ (yds/lb) Yield (yds/lb) = 496,055 ÷ TEX
TEX = 590.5 ÷ Cotton Count Cotton Count = 590.5 ÷ TEX
Denier = 5,315 ÷ Cotton Count Cotton Count = 5,315 ÷ Denier
Denier = TEX x 9.0

TPI TPM TPI TPM
0.5 20 3.0 120
0.1 28 3.5 140
1.0 40 3.8 152
1.3 52 4.0 160
2.0 80 5.0 200
2.8 112 7.0 280