About this app

Enter a win probability and a win/loss ratio to get your edge, the full Kelly fraction and the half and quarter stakes in dollars. Then watch one identical run of 150 bets staked three different ways on a log chart, which shows immediately why full Kelly maximises growth and still feels unbearable. Includes the reason fractional Kelly is insurance against your own estimate rather than timidity.

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Win rates and risk grades are computed by Masterboard from tracked trade outcomes after the strategy is assessed — not self-reported by sellers. Past performance does not guarantee future results.