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# Fabric Weight Calculation in GSM

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## Fabric Weight Calculation in GSM (Woven Fabric)

GSM calculation of fabric

Fabric is the basic raw material to produce any particular garments . Before going to bulk production , it is quite essential to know and test the GSM of the supplied fabric by the supplier. This GSM can directly be got through  GSM cutter .

But the GSM can be theoretically evaluated via some calculations . We will discuss here that process.

What is GSM?

Fabric GSM means the weight of fabric in grams in per square meter area. So the higher the GSM , the higher bulkier will be the fabric and vice versa , even they can be of same construction

Fabric Costruction

Fabric  Construction is a term in which some fabric detailing are available such as

EPI (Ends per inch –warp)

PPI (Picks per inch – weft)

Warp count

Weft count

fabric width (in inches) .

The formula :

Some Examples :

Calculation of GSM :

We wil calculate GSM for  below one here –

Warp weight calculation :

Here ,       EPI = 92

So total number of ends = 92×39.37

= 3622.04

(as we have to go to meter cause EPI is in inches but GSM is in meter unit and 1 meter=39.37 inches )

Length of each 1 meter yarn allowing the crimp %  = 1m + 1m x 3%  ( Let, warp crimp = 3%)

= 1m + 1m x  0.03

= 1m + 0.03 m

= 1.03 m

(this is necessary to find out 1 meter yarn length because when we take 1 meter in both warp and weft , it’s covered area will be 1m x 1m =1 m which is identical to GSM unit that is – Grmas per Square Meter)

So . total length of warp yarn = 3622.04×1.03

= 3730.71 m

( Here , L = Length found , w=1 lb  =  453.6 gm , W= Weight found/needed , l = 840×0.9144 meter)

[ As from the above formula , 453.6 gm means  1lb and 0 .9144 meter means 1 yd which came from the definition of Ne where weight unit is fixed to 1lb and length unit to 840 yds as a constant in the formula]

The number of hanks required of each having  840yds (1 hank)  of yarn that can make 1 lb weight is called the count (Ne) of that yarn.

Weft  weight calculation :

Here , PPI = 104

So total number of ends = 104×39.37 = 4094.48

Length of each 1 meter yarn allowing the crimp %  = 1m + 1m x 5%  ( Let, warp crimp = 5%)

= 1m + 1m x  0.05

= 1m + 0.05 m

= 1.05 m

So . total length of weft yarn = 4094.48×1.05

= 4299.21 m

=      31.74 gm

So the GSM of the fabric will be = 27.54 + 31.74

= 59.28

Here is a screenshot of a GSM calculator giving the same input and the result is correct !