Optimal fraction of capital to risk per trade given your edge.
All three inputs come from your own trade history. The Kelly criterion is only as good as the inputs; if you're guessing your win rate, you'll over-bet.
Full Kelly maximizes the long-run growth rate of capital but produces dramatic drawdowns (50%+ peak-to-trough is common). Half-Kelly captures ~75% of the long-term return with much smaller drawdowns. Most professional managed funds use 0.25-0.5× Kelly, not full Kelly.
Pair this with the position size calculator for the actual dollar amount given an entry/stop.
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