Kelly Calculator

The Kelly Criterion is a world-renowned mathematical formula used by professional bettors to manage their bankroll. It determines the optimal stake for any given bet to ensure maximum exponential growth while strictly protecting you from the risk of going broke.

Understanding the Inputs
To get an accurate recommendation, start by entering your total Bankroll—the amount you have dedicated to your betting activity. Next, input the Odds provided by the sportsbook and your estimated Win Probability. For the best results, use the probability percentage calculated by our EV Tool to ensure you are betting with a verified edge.

Adjusting Your Risk (The Multiplier)
The Kelly Multiplier (Risk Level) field allows you to customize how aggressive you want to be. While “Full Kelly” (1.00) is mathematically optimal for growth, it is also highly volatile. Most professional bettors prefer a more conservative approach:
• 1.00 (Full Kelly): Maximum growth, but very high volatility.
• 0.50 (Half Kelly): A balanced approach that significantly reduces swings.
• 0.25 (Quarter Kelly): The default and safest setting for long-term stability.

Interpreting the Dashboard
The results are broken down into three sections. The Expected Value confirms if the bet is profitable. The Fraction of Bankroll shows the recommended percentage of your total funds to wager, and the Amount to Wager provides the exact dollar figure for your bet slip based on your current bankroll.