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LeaderCalc

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 2889 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: Nymph, for unweighted nymphs

Category: Nymph/Wet Fly Leaders
NameSectionsTippetLengthLineFormula

3X - 8.5'
Show all variations

83X
0.0080"
8.5'4-7wt.
15" of 0.0210
15" of 0.0190 (07X)
15" of 0.0170 (05X)
15" of 0.0150 (03X)
9" of 0.0130 (01X)
8" of 0.0120 (00X)
6" of 0.0100 (1X)
18" of 0.0080 (3X)
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Randomly selected: Right Angle Nymph Leader

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.
NameSectionsTippetLengthLineFormula

5X - 10.0'
Show all variations

45X
0.0060"
10.0'4-7wt.
48" of 0.0180 (06X)
24" of 0.0100 (1X)
24" of 0.0070 (4X)
24" of 0.0060 (5X)
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