GSM stands for Grams per Square Meter, a unit for measuring fabric weight.
The GSM can also be calculated by using some machines and apparatus. But, the simplest method of calculating GSM is to cut 10*10 cm of any fabric and weigh it. It is then multiplied with 100.
For eg. If the weight of the fabric (10*10 cms) is 2 gms, the GSM of the fabric will be 200.
The other numerical formula for GSM is stated below:
The higher the GSM, the higher the thickness and weight of the fabric will be. GSM is an indication of the quality of the fabric too.