Kelly Calculator
Calculate optimal bet size using the Kelly Criterion to maximize long-term growth while managing risk
What is the Kelly Criterion?
The Kelly Criterion is a mathematical formula that helps you determine the optimal size of a series of bets to maximize long-term growth of your bankroll. It balances maximizing returns with minimizing risk of ruin.
Formula: f = (bp - q) / b, where f = fraction to bet, b = net odds, p = win probability, q = lose probability
Calculator
Your estimated chance of winning this bet
Results
Enter your bet details to see the optimal bet size
Important Notes
- • Kelly sizing can be aggressive. Consider fractional Kelly (1/4 or 1/2) for more conservative approach
- • Only bet on positive expected value (+EV) opportunities
- • Your win probability estimate is crucial - be realistic and conservative
- • Never bet money you can't afford to lose
- • This is a mathematical tool, not gambling advice