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

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 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: Wet Fly, Long

Category: Nymph/Wet Fly Leaders

6X - 10.5'
Show all variations

33" of 0.0190 (07X)
16" of 0.0170 (05X)
14" of 0.0150 (03X)
12" of 0.0130 (01X)
9" of 0.0110 (0X)
9" of 0.0090 (2X)
9" of 0.0070 (4X)
23" of 0.0050 (6X)

Randomly selected: Schweitzer's Dry, Windy Conditions

Category: Dry Fly Leaders
This leader is made to turn over a dry fly a bit easier in windy conditions while still allowing for enough slack for floating a dry fly in tricky currents.
Add more tippet to accommodate a longer drift pattern (similar to Harvey slack).

5X - 9.5'
Show all variations

40" of 0.0190 (07X)
32" of 0.0150 (03X)
11" of 0.0120 (00X)
8" of 0.0090 (2X)
23" of 0.0060 (5X)


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