How to Use Kelly Criterion in Betting? Admin July 3, 2025

How to Use Kelly Criterion in Betting?

kelly criterion betting formula diagram

Mastering the Kelly Method

Kelly Criterion is a smart betting strategy that helps gamblers manage their bankroll and bet more efficiently. The Kelly criterion is used by experienced bettors who want to calculate the perfect stake size for each bet. It aims to grow profits while minimizing the risk of losing everything. In this article, we’ll explore how to use Kelly Criterion in betting and why it’s a powerful tool for disciplined wagering.

What Is Kelly Criterion?

The Kelly criterions is a formula developed in the 1950s to maximize long-term growth. In betting, it helps determine how much of your bankroll to place on a specific wager based on the perceived edge. If you believe your bet has a real advantage over the odds, Kelly helps you stake more when the edge is high and less when it’s low.

Kelly Criterion Formula Explained

The basic formula is:
f = (bp – q) / b
Here:

  • f is the fraction of your bankroll to bet,

  • b is decimal odds minus 1,

  • p is the probability of winning,

  • q is 1 – p (the probability of losing).

If the result is negative, it means you shouldn’t place the bet. A positive result gives you the percentage of your bankroll to wager.

Benefits of Kelly Criterion

Using Kelly criterions keeps your bets proportional to your advantage. This avoids both overbetting and underbetting. It protects your bankroll during losing streaks and encourages smart risk-taking when the odds are in your favor.

When to Avoid Using It

This method works best when your probability estimates are accurate. If you guess or use emotions, the formula won’t help. Also, Kelly can be aggressive if you use the full recommendation. That’s why some bettors prefer using half-Kelly or a fixed percentage of what the formula suggests.

Is It Right for You?

If you bet regularly and use data to make decisions, Kelly Criterion can improve your results. But if you’re a casual gambler, a flat betting system might be safer and simpler. The method requires discipline, math, and consistent logic.

Conclusion: Smarter Bankroll Use

Kelly criterion is ideal for bettors who want long-term growth and bankroll control. It’s not magic, but when used correctly, it gives structure to your betting decisions and reduces reckless wagers.