How to Calculate GSM of Fabric?

It this first time your heard GSM?

GSM stands for grams per square meter. Fabric GSM means weight of one square meter fabric in grams. GSM is also written as gm/m2.

You can determine GSM for woven and knitted fabric using following methods.

By means of instruments:

Apparatus required

i) Round GSM cutter and
ii) Weighing Balance.

Method: Cut 5 swatches from different place of the fabric. Weight all test swatches accurately and calculate average weight of swatches.

Multiply average weight of swatches by 100 to calculate GSM of the sample fabric. (Normally, area of round GSM cutter is 1/100 square meters.)
GSM Cutter
GSM Cutter
image courtesy: 

By using Formula:

No need to worry  if you don’t have a round GSM cutter. You can still measure fabric weight per square meter by using following formula.