Yarn count calculation formula

  Yarn count calculation formula: 

The yarn is how much finer or how much coarser that defines the count of that yarn . Another definition is , Number of hanks in one pound (lb) where 1 hank = 840 yards . 

Mathematically , 

                                     L

                                    L'

Yarn count =.......................................

                                  W

                                 W'

                          L                  W'

Yarn count = ..........  x      ..............

                        L'                  w

If a yarn cone given to you to find out the yarn count then we can use above formula to get the actual yarn count . For this purpose we need a wrap reel machine of 54 inch(1.5 yards ) circumference . Then we need to run the reel 80 round that means we get (1.5 yards x 80)=120 yards . Then we weight this sample in gram and got 2.05 gram . 

Here, L=Sample length = suppose it is 120 yards 

L'=840 yards 

W= Sample weight=suppose it is 2.05 gram 

W'=1 lb = 453.56 gram 

Now we put the value in above formula and get , 

                           120                 453.56

  Yarn count =.............     x  .....................

                         840                   2.05

               =31.60 

              =32 S/1