AFTMA FLY LINE STANDARDS
             
Line  Weight Range   Line  Weight Range
             
1 60 64 - 66   7 185 177 - 193
2 80 74 - 86   8 210 202 - 218
3 100 94 - 106   9 240 230 - 250
4 120 114 - 126   10 280 270 - 290
5 140 134 - 146   11 330 318 - 342
6 160 152 - 168   12 380 368 - 392
             

These universal standards are based on the weight of the working part of the line the first 30 ft, exclusive of the tip on a taper.

Weight is in grains. Range is allowable tolerance's.

These universal standards are based on the weight of the working part of the line the first 30 ft, exclusive of the tip on a taper.
 
 
Standards in Grains and Grams for the first 30 feet
 
Fly Line Rating 1 2 3 4 5 6 7 8 9 10 11 12 13 14
Weight in Grains 60 80 100 120 140 160 185 210 240 280 330 380 420 455
Weight in Grams 3.89 5.18 6.48 7.78 9.07 10.37 11.99 13.61 15.55 18.14 21.38 24.62 27.22 29.48
 
The weight of the most line the rod can aerialize typically is another 30 feet or so (60 feet of line in the air), or about 20-25 grains more.

When sizing a shooting head for a rod, choose a weight of the head equal to the weight of line that properly loads the rod with as much normal fly line as can be aerialized.