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LeaderCalc

Select the desired specifications for your leader and press "Find leaders" to look up suggestions.

Quick use

The most advanced and comprehensive fly fishing leader tool online ... well, basically anywhere!
Using the form above you can ask LeaderCalc to caculate and show you a number of fly fishing leader formulas meeting your selected criteria. You can read more about the selection tool here.
LeaderCalc currently contains 2963 leaders for fly fishing, so there are enough to choose from.

Below you see a couple of randomly selected knotted, tapered leader formulas. Click on the name, category or other elements to see more.

Randomly selected: Bob Miller's Formula 2

Category: Name-Specific Formulas
Light line.
From Fly Fisherman Magazine.
NameSectionsTippetLengthLineFormula

7X - 8.0'
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77X
0.0040"		8.0'2-4wt.
24" of 0.0130 (01X)
20" of 0.0100 (1X)
18" of 0.0090 (2X)
13" of 0.0080 (3X)
9" of 0.0070 (4X)
6" of 0.0060 (5X)
6" of 0.0040 (7X)
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Randomly selected: Leonard Positive Turn-Over

Category: Dry Fly Leaders
These formulas were kindly provided by Swedish Johan Allgén. They were measured from two original HL Leonard Rod Co hand tied leaders. The sections were slightly uneven, but roughly followed the form: 18-18-18-18-20-20 inches. The leaders were labeled 9', but were more like 9.5' including a perfection loop in the butt end.
NameSectionsTippetLengthLineFormula

5X - 9.5'
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65X
0.0060"		9.5'4-6wt.
18" of 0.0210
18" of 0.0170 (05X)
18" of 0.0150 (03X)
18" of 0.0120 (00X)
20" of 0.0090 (2X)
20" of 0.0060 (5X)
Save | Labels
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