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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 2973 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: Dry, Harvey Slackline Variation

Category: Dry Fly Leaders
NameSectionsTippetLengthLineFormula

5X - 9.0'
Show all variations
Show similar

75X
0.0060"
9.0'3-5wt.
9" of 0.0170 (05X)
17" of 0.0150 (03X)
17" of 0.0130 (01X)
17" of 0.0110 (0X)
10" of 0.0090 (2X)
17" of 0.0070 (4X)
21" of 0.0060 (5X)
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Randomly selected: Bob Miller's Formula 2

Category: Name-Specific Formulas
NameSectionsTippetLengthLineFormula

6X - 10.0'
Show all variations
Show similar

76X
0.0050"
10.0'2-4wt.
30" of 0.0130 (01X)
25" of 0.0100 (1X)
23" of 0.0090 (2X)
16" of 0.0080 (3X)
11" of 0.0070 (4X)
8" of 0.0060 (5X)
7" of 0.0050 (6X)
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