Kelly Criterion Calculator
Optimize your bankroll management • Calculate the ideal bet size
📚 Educational tool • Professional risk management
Bet Configuration
Analysis Results
💰 IDEAL BET
$ 0.00
📊 % OF BANKROLL
0%
🎯 EXPECTED VALUE
$ 0.00
📈 EXPECTED EDGE
0%
📊 Enter the data above to calculate the ideal bet
📚 What is the Kelly Criterion?
🎲 What is the Kelly Criterion?
The Kelly Criterion is a mathematical formula to maximize bankroll growth in betting or investing. It is considered one of the most efficient risk management strategies.
📊 Kelly Formula
f* = (p × odds - 1) / (odds - 1)
Where:
- f* = fraction of bankroll to bet
- p = true probability of winning (0 to 1)
- odds = decimal odds offered
📈 Practical Example
Odds 2.50 and 45% true probability:
f* = (0.45 × 2.50 - 1) / (2.50 - 1) = 8.33% of bankroll
✅ Fractional Kelly
Many bettors use half Kelly or quarter Kelly to reduce volatility. For beginners, 25-50% of full Kelly is recommended.
⚠️ This content is educational only. The Kelly Criterion is a mathematical tool, not a guarantee of results. Bet responsibly.