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.

Metric or Imperial

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, 14.5'

Name	Sections	Tippet	Length	Line	Formula
Jonas Erbs Salmon Show this only Show similar	4	04X 0.0160"	14.5' (7.5-15.5')	9-11wt.	177 cm of 0.60 118 cm of 0.50 (08X) 88 cm of 0.45 (06X) 59 cm of 0.40 (04X)
Category: Salmon/Steelhead/Sea trout
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Category: Saltwater

1 variation, 0X, 10.5'

Name	Sections	Tippet	Length	Line	Formula
Orvis Salt, Steelhead, Bass. Long, Delicate Show this only Show similar	6	0X 0.0110"	10.5' (10.0-12.0')	4-7wt.	64 cm of 0.53 60 cm of 0.48 (07X) 53 cm of 0.43 (05X) 47 cm of 0.38 (03X) 36 cm of 0.33 (01X) 60 cm of 0.28 (0X)
Category: Saltwater
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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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