Line Weight Attributes

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This is the table for fly line weight.  AFTMA (American Fishing Tackle Manufacturers Association) defines the weight of fly lines by the length of 30 feet from the tapered end.  

This table is calculated each part of DT and WF line considering taper part, level part based on AFTMA numbers. 

This table is used to calculate the weight of fly line, for the Line length to Fish and Line on the rod.

Unit is basically in ounce.   Screen is divided into two part, left is for Double Taper and right is for Weight Forward.

Line Weight Calculator:

By specifying line type, line weight number and line length, the calculator will show the resulted weight in ounce and gram.   Hit [Calculate] button after data are specified.

Data on Screen

Item meaning
Line # Line Weight number
30ft WT
grain Weight for top 30 feet in grain. 
ounce Weight for top 30 feet in ounce. 
gram Weight for top 30 feet in gram. 
Double Taper Line
DT12ft Total weight of top 12 feet of DT line
DT66ft Weight per feet for 66 feet of middle level part 
DT12ft Total weight of last 12 feet of DT line
DT90ft
90ft wt Total weight for full line of 90 feet in ounce.
gram Total weight for full line of 90 feet in gram.
Weight Forward Line
WF12ft Total weight of top 12 feet of WF line in ounce
WF20ft Weight per feet of 20 feet for mid taper part
WF16ft Weight per feet of 16 feet for mid taper part 
WF42ft Weight per feet of 42 feet for level part 
WF90ft
90ft wt Total weight for full line of 90 feet in ounce.
gram Total weight for full line of 90 feet in gram.