Fabric Weight Area weight and the roll it becomes

Fabric Weight g/m2

Finished Width cm

Yarn & Tenacity Specific strength needs a linear density; true stress needs a fibre density

Tenacity cN/tex

Yarn Linear Density tex

29.5 tex is Ne 20

Fibre Density g/cm3

PET 1.38, cotton 1.54, nylon 6.6 1.14, PP 0.91

Fabric Weight

— oz/yd2

The imperial equivalent of the stated GSM

Every Equivalent Unit

Weight per Linear Metre: — g/m
Weight per Linear Yard: — oz/yd
Tenacity: — g/den
True Stress at Break: — MPa
Breaking Length: — km
Breaking Force at this Count: — N
Yarn Length: — m/kg
Yarn Length: — yd/lb

Every constant here is exact by definition rather than measured: the international yard is exactly 0.9144 m and the avoirdupois pound exactly 0.45359237 kg, so the conversions carry no experimental uncertainty of their own. What they do carry is the uncertainty of the input - a GSM taken from a single 100 cm2 cutter on a fabric with 3% weight variation is precise to four figures and accurate to two. The true-stress figure assumes a solid circular cross-section at the stated density and is meaningful for melt-spun filament; for a staple yarn it is a nominal value only, because a spun yarn has air in it and no single cross-sectional area exists. Yarn count conversion between Ne, Nm, tex and denier lives in the dedicated count converter rather than here.

Textile Unit Converter: Fabric Weight, Tenacity & Yarn Length — free, with the formula and a worked example, at Textile School.