Professional Kelly Criterion Calculator
Calculate optimal bet sizes for maximum long-term growth
Use the Kelly Criterion formula to determine mathematically optimal bet sizing based on your edge and bankroll. Read our complete Kelly Criterion guide →
Recommended Bet Size
0.0%
Bet Amount: $0.00
Kelly Criterion Input Parameters
Enter your total available bankroll in dollars
Enter the decimal odds offered by the bookmaker
Enter your assessment of the true probability of winning
Use fractional Kelly (e.g., 0.5 for half Kelly) to reduce variance
Kelly Analysis
Understanding Kelly Criterion
The Kelly Criterion is a mathematical formula used to determine the optimal size of a series of bets. It maximizes the expected logarithm of wealth, which corresponds to maximizing the median final wealth.
Formula: f = (bp - q) / b
- f = fraction of bankroll to bet
- b = odds received (decimal odds - 1)
- p = probability of winning
- q = probability of losing (1 - p)
Important: Only bet when you have a positive expected value (edge). Never bet more than the Kelly recommendation suggests.
📚 Learn More: Read our comprehensive guides on
Kelly Criterion strategy and
bankroll management for advanced betting techniques.