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: Salmon/Steelhead/Sea trout
A simple and straightforward salmon leader. Provided by Danish Jonas Erbs. Based on A formula originally - and somewhat reluctantly - shared with Jonas by the late Per Carlsen. Can be tied with mono as well as fluorocarbon.

1 variation, 04X, 15.5'

Name Sections Tippet Length Line Formula

Jonas Erbs Salmon


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 4 04X
0.0160"		 15.5'
(7.5-15.5')		 9-11wt.
74" of 0.0240
50" of 0.0200 (08X)
37" of 0.0180 (06X)
25" of 0.0160 (04X)
Category: Salmon/Steelhead/Sea trout
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Category: Nymph/Wet Fly Leaders
A leader that's meant to deliberately form a "hinge" between the butt and section 2 where you typically attach an indicator. Adjustments should be made by adding to section 2. For fast current 1.5 times the water depth is suitable. For slower water 1-1.25 times the depth is normally good.

1 variation, 0X, 10.0'

Name Sections Tippet Length Line Formula

Right Angle Nymph Leader


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 4 0X
0.0110"		 10.0'
(10.0-11.0')		 8-10wt.
48" of 0.0220
24" of 0.0160 (04X)
24" of 0.0130 (01X)
24" of 0.0090 (2X)
Category: Nymph/Wet Fly Leaders
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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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