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LeaderCalc

Please notice: LeaderCalc hasn't been optimized for small screens. Turning some devices horizontally might make it easier to use, but using a suitably large screen is the best solution.
Select the desired specifications for your leader and press "Find leaders" to look up suggestions.
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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.

Category: Two handed
A super simple and sturdy three section leader using the 60% - 20% - 20% formula meant to be used on 10-12-15' foot two hand (spey) rods in the line classes 9-12. Tippets vary from light salmon to heavy steelhead and king salmon.

1 variation, 1X, 12.5'

Name Sections Tippet Length Line Formula

Two-handed 60-20-20


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3 1X
0.0100"
12.5'
(12.0-15.0')
9-11wt.
90" of 0.0180 (06X)
30" of 0.0140 (02X)
30" of 0.0090 (2X)
Category: Two handed
Category: Modern nymphing leaders
Designed by French Pascal Cognard, specified by South African angler MC Coetzer in the magazine Piscator. For open water, but smaller rivers, with no or light wind.

1 variation, 6X, 14.0'

Name Sections Tippet Length Line Formula

Coetzer Medium River


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8 6X
0.0050"
14.0' 3-5wt.
35" of 0.0170 (05X)
24" of 0.0130 (01X)
12" of 0.0120 (00X)
4" of 0.0100 (1X)
12" of 0.0090 (2X)
16" of 0.0070 (4X)
19" of 0.0060 (5X)
47" of 0.0050 (6X)
Category: Modern nymphing leaders
Calculating...
Selecting all leaders will show you more than 2,500 leaders. Please narrow your criteria
Selecting All for two or more of your criteria can result in a lot of leaders and can potentially take some time to find. Consider narrowing your search... or just give it a go!

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