Enter the total weight of the sample in grams and the area of the sample in cm^2 to determine the grams per square meter (GSM).

GSM Formula

The following formula is used to calculate the grams per square meter of a piece of fabric.

GSM = Wg * 10,000 / (L*W)

  • Where Wg is the weight of the sample (grams)
  • L is the length of the sample (cm)
  • W is the width of the sasmple (cm)
  • GSM is the grams per square meter (g/m^2)

GSM Definition

What is GSM?

GSM, short for grams per square meter, is a metric used to describe the weight per unit area of a piece of fabric. This could be used for any piece of material but is most often used in the field of fabric cutting.

Example Problem

How to calculate GSM?

First, determine the total weight of the sample. For this example, the piece of fabric is measured to be 4 grams.

Next, measure the length of the fabric. For this problem, the length is measured to be 30cm.

Next, measure the width of the fabric. In this case, the width is measured to be 20cm.

Finally, calculator the grams per square meter using the formula:

GSM = W * 10,000 / L*W

GSM = 4 * 10,000 / (20*30)

GSM = 66.66 GSM (g/m^2)