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I have Reed Pick Per Inch Thread Count and Width of the Fabric How can you calculate gsm by construction of Woven fabric?

For Warp Weight,
(5315*reed space*EPI*110)/(9000*1000*warp Count) Kgs/100 mtr.
For weft weight
(5315*reed space*PPI*103)/(9000*1000*weft Count) Kgs/100 mtr.
Add both you will get Fabric weight in Kgs for 100 mtr.
Here 5 % is warp crimp and 5 % is warp Shrink.
3 % is weft crimp.
If you want gms/mtr square i.e GSM then Divide the fabric weight by width of fabric in mtrs.
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