Thread Density to GSM

What is Thread Density and GSM?

Thread Density (TPI) is the number of threads per inch in a fabric, both in the warp and weft directions. Higher TPI generally means tighter weave.

GSM (grams per square meter) measures the weight of fabric. Heavier fabrics have higher GSM.

How to Convert Thread Density to GSM

While exact conversion depends on fiber type and weave, a general formula for cotton-like fabrics is:

GSM = TPI × 1.7

Example:
If TPI = 100, then GSM = 100 × 1.7 = 170 gsm

Thread Density to GSM Conversion Table