Please notice: LeaderCalc hasn't been optimized for small screens. Turning some devices horizontally might make it easier to use.


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

Quick use

December 2019: The LeaderCalc pages have been slightly updated with more leaders and new facilities.
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 this new tool here.
Leadercalc currently contains 2791 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: Big Bass

Category: Panfish/Bass/Pike/Musky

0X - 11.0'
Show all variations

40" of 0.0180 (06X)
33" of 0.0140 (02X)
13" of 0.0130 (01X)
26" of 0.0120 (00X)
20" of 0.0110 (0X)

Randomly selected: Korich Two-Handed Distance

Category: Precision and distance leaders
Designed by Chris Korich for distance casting. Recommended leader material is Maxima, tippet is Green Stren

06X - 16.5'
Show all variations

66" of 0.0330
44" of 0.0280
33" of 0.0240
22" of 0.0220
33" of 0.0180 (06X)


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The GFF money box

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Long story short

Support the Global FlyFisher through several different channels, including PayPal.

Long story longer

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See more details about what you can do to help in this blog post.