Kelly Criterion Calculator
Calculate optimal bet sizing for maximum long-term bankroll growth
The Kelly Criterion is a mathematical formula used to determine optimal bet sizing. It balances maximizing growth with minimizing risk of ruin.
Input Values
Enter your betting parameters
Your estimated probability that this bet will win (0-100%)
The odds offered by the sportsbook (e.g., 2.50)
Many pros use 25-50% Kelly to reduce variance. 100% = Full Kelly.
⚠️ Important Notes:
- • Kelly assumes your probability estimate is accurate
- • Full Kelly can be volatile; fractional Kelly (25-50%) is safer
- • Never bet more than you can afford to lose
- • Recalculate after significant bankroll changes