Kelly Criterion Calculator
Calculate the optimal bet size based on your edge and bankroll. The Kelly Criterion maximizes long-term growth while managing risk.
What is the Kelly Criterion?
The Kelly Criterion is a mathematical formula that determines the optimal bet size to maximize long-term bankroll growth. It balances the desire to bet big when you have an edge with the need to avoid catastrophic losses.
Fractional Kelly: Most professional bettors use half or quarter Kelly to reduce variance and account for uncertainty in their probability estimates.
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Responsible Gambling
Gambling should be entertaining, not a way to make money. Only bet what you can afford to lose, and never chase your losses.
- Betting more than you can afford to lose
- Chasing losses with bigger bets
- Lying to others about gambling habits