Input your bankroll, the odds you're getting, and your win probability. Get the mathematically optimal bet size (full Kelly, quarter Kelly, eighth Kelly). The same formula every pro uses.
Implied Probability
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Edge
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Full Kelly
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1/4 Kelly (recommended)
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1/8 Kelly (conservative)
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Expected $ Profit
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Why 1/4 Kelly? Full Kelly is mathematically optimal but assumes perfect win-probability estimates. Real-world models have error — 1/4 Kelly cuts variance by 75% while keeping ~94% of long-term growth. It's what every professional bettor uses.
Why "max % cap"? Even Kelly can recommend 15-20% on huge edges, which feels insane. Capping at 5-10% protects against model overconfidence. Lower cap = more conservative.
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