How to Calculate Fabric GSM?

In this post, I will explain what does GSM means and the fabric GSM calculation method (woven and knits fabric) using a formula and using the equipment. 

What is GSM?

GSM stands for grams per square meter. Fabric GSM means the weight of one square meter of fabric in grams. GSM is also written as gm/m2. You can calculate GSM for woven and knitted fabric using one of the following methods.

Calculating Fabric GSM by means of instruments:

First, I will show you the names of all equipment that you will be needed to calculate the GSM of the sample fabric and then will show you the methods for calculating fabric GSM.

Apparatus required
  1. Round GSM cutter and GSM Pad
  2. Weighing Balance.
Method:
  1. Cut 5 swatches from the different places of the fabric.
  2. Weight all test swatches accurately and calculate the average weight of swatches.
  3. Multiply the average weight of swatches by 100 to calculate the GSM of the sample fabric. (Normally, the area of round GSM cutter is 1/100 square meters.)


Fabric GSM calculation by using a Formula:

No need to worry if you don’t have a GSM cutter. 

You can still measure fabric weight per square meter by using the following formula. 


To calculate fabric GSM using this formula, the take on fabric swatch is a square shape. For example, 50 cm x 50 cm fabric. Take the weight of this fabric swatch, calculate the area in a square centimeter.  Once you have the required information, calculate the weight of the fabric in GSM using the above formula.