Kelly Criterion Calculator

Written By John Carlo Villaruel | Last Updated at March 24, 2026

The Kelly Criterion calculator can provide a maths-based approach to managing your bankroll, helping to take the emotion out of online sports betting. With one simple formula, it offers guidance on how big or small your wager should be.

On this page, you can find our dedicated Kelly Criterion sports betting calculator. Just input the relevant information carefully, and the calculator will reveal an estimated wager amount. Keep reading as we cover more details on how this calculator works and what you need to know.

What is the Kelly Criterion?

The Kelly Criterion is a formula that can be used to determine how much of your bankroll you should risk on any given bet to maximize long-term returns. This is popular in online sports betting, as it helps avoid betting too little or too much. While this can be a useful tool to help you bet more responsibly, it’s still important to use your own judgement. The Kelly Criterion calculator should only be used for guidance, not as a foolproof betting strategy.

How does our Kelly Criterion calculator work?

Our Kelly Criterion sports betting calculator determines the optimal fraction of your bankroll for any given bet, based on your estimated edge and the odds offered by the sportsbook. Here is the formula that the calculator uses: f = (bp − q) / b.

The different letters in this equation represent the following:

Formula letter	What it represents
f	The fraction of your bankroll to bet
b	The net odds received
p	The probability of winning
q	The probability of losing (1 – p)

Pros and cons of the Kelly Criterion sports betting calculator

Here is a quick summary of the pros and cons of using our Kelly Criterion calculator:

Pros and Cons

Protects against overbetting
Removes emotion from betting
Adapts to different odds
Encourages disciplined betting

Requires accurate inputs

Use the calculator for smarter, more responsible betting habits

While the Kelly Criterion won’t help you win more bets, it’ll certainly help you better manage your bankroll, which makes it a powerful tool. By adding the net odds of your bet and the probability of it landing, you can determine an optimal wager size, which helps to remove emotions from your bets and encourage responsible long-term betting habits. That said, the betting calculator should be used as guidance, rather than concrete advice. So make sure you stick with bets that you’re genuinely comfortable with.

Kelly Criterion calculator FAQs

🤔 Can I trust the Kelly Criterion calculator?

Yes, the calculator is mathematically accurate. That said, you’ll need to ensure you’ve entered the odds and probabilities accurately.

🧮 What are the half-kelly and quarter-kelly?

Half-kelly means you bet 50% of whatever the Kelly Criterion calculator recommends, and for the quarter-kelly, you’ll bet 25%. This helps to reduce your risk while still taking advantage of the benefits the calculator provides.

❓ Does the Kelly Criterion calculator prevent losing streaks?

No, it cannot prevent or mitigate the likelihood of a losing streak. However, it should help to reduce any negative impacts, particularly if you’re someone who is susceptible to emotional betting.