KELLY CRITERION CALCULATOR

Compute full and fractional Kelly bet sizes from your edge and your bankroll. The formal answer to how much to risk on a positive-EV bet.

Kelly Sizing

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American odds

Your probability (%)

Bankroll ($)

Kelly fraction

Recommended sizing

Full Kelly %14.09%

Fractional Kelly %3.52%

Edge over market+7.38%

Full Kelly stake$1409.09

Fractional Kelly stake$352.27

Implied prob47.62%

Full Kelly maximizes long-run growth assuming you know the probability exactly. In practice, most operators bet quarter or half Kelly to dampen drawdowns. Negative Kelly means the bet is negative EV; do not bet.

This tool is provided for educational purposes. It does not constitute financial or betting advice. Bet responsibly. 21+ where legal. 1-800-GAMBLER.