Kelly Criterion Calculator

The Kelly Criterion is a mathematical formula that helps bettors determine the optimal bet size based on their win probability and odds. It is widely used in sports betting and financial investments to maximize long-term growth while managing risk.

Use our Kelly Criterion Calculator to find the perfect bet size based on your edge over the bookmaker.

Win Probability (%)

Decimal Odds

How to Use the Kelly Criterion Calculator:

Enter your estimated win probability (%).
Input the decimal odds offered by the bookmaker.
Click Calculate to determine the optimal bet size.

Why Use the Kelly Criterion?

Betting with the Kelly Criterion ensures that you:

Maximize Long-Term Growth: The formula optimally adjusts bet sizes to avoid over-betting or under-betting.
Manage Risk Effectively: It prevents rapid bankroll depletion by reducing bet size on low-edge bets.
Avoid Gamblers Ruin: Unlike flat betting, Kelly Criterion adjusts to your edge, ensuring you dont lose everything too quickly.

Pro Tip:

Many professional bettors use a Fractional Kelly (e.g., betting half of the recommended Kelly amount) to reduce risk and bankroll volatility.

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