LeaderCalc is an online tool that allows you to calculate the section lengths of your knotted leaders based on a large number of leader formulas including some of the best known and most popular leader designs available.

The original version was a Microsoft Excel spreadsheet developed by Global FlyFisher partner Steve Schweitzer. In 2016 it was updated to an online tool by Martin Joergensen. 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.

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