Typical Fly Usage For Leader Sizes

To calculate leader size a time used formula is to divide the fly size by 3, this gives you and approximate tippet size.

For example for a size 16 fly 16/3 = 5.33 so recommended leader diameter should be 5x to 6x

Diameter

(mm)

Diamteter

(inch)

Butt Diameter

(mm)

Butt Diameter

(inch)

Typical fly hook

size useage

0.789 0.011 0.64 0.025 2
0.254 0.010 0.58 0.023 4-8
0.229 0.009 0.56 0.022 6-10
0.203 0.008 0.53 0.021 10-14
0.178 0.007 0.53 0.021 12-16
0.152 0.006 0.5 0.02 14-18
0.127 0.005 0.43 0.017 16-22
0.102 0.004 0.43 0.017 18-24

 

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