Kelly Criterion Calculator

The Kelly Criterion is a mathematical formula that determines the optimal bet size to maximize long-term bankroll growth. Unlike flat betting, Kelly sizes your wagers proportionally to your edge.

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Full Kelly vs. Fractional Kelly

Full Kelly maximizes theoretical growth rate but produces stomach-churning swings. Most professional bettors use Half Kelly or Quarter Kelly for dramatically smoother results. Click the simulation button to see how different Kelly fractions perform over 300 bets with your specific edge and odds.

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