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.
Kelly Criterion Strategy Guides
Kelly Criterion Betting Guide
Master optimal bet sizing with practical examples and fractional Kelly strategies.
Parlay Portfolio Theory (Advanced)
Apply Kelly to diversified bet portfolios using Modern Portfolio Theory and round robins.
Bankroll Management Guide
Learn unit sizing, risk of ruin, and strategies to protect and grow your bankroll.
This calculator is for informational and educational purposes only. Results should be verified with your sportsbook before placing any wagers. All betting carries risk. Full Disclaimer
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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