Kelly Criterion Calculator

The Kelly Criterion Calculator helps you size bets for long-term bankroll growth. Enter your bankroll, the odds you’re betting, and your estimated chance of winning. The tool shows the optimal Kelly stake (plus half- and quarter-Kelly options), your edge versus the line, and the expected value – so you can manage risk with confidence.

If you’re serious about taking your betting to the next level, check out our step-by-step sports betting courses. Each strategy has been backtested with over 10 years of data.

For education only. Kelly sizing can be volatile; many bettors prefer fractional Kelly. Always verify odds and gamble responsibly.

How to Use the Kelly Criterion Calculator

The Kelly Criterion Calculator helps you size your bets for long-term bankroll growth.

Inputs

  • Bankroll ($) – Enter your total betting bankroll. Example: 1,000.

  • Odds – Input the odds being offered (choose American, Decimal, or Fractional).

  • Win Probability (%) – Enter your own estimated chance of winning (based on your research or model).

Outputs

  • Optimal Bet (% of Bankroll) – The percentage of your bankroll the Kelly formula suggests you wager.

  • Optimal Bet ($) – The dollar amount to stake, based on your bankroll size.

  • Fractional Kelly Options – Many bettors choose to use half-Kelly or quarter-Kelly for safety. These amounts are also shown.

Example: With $1,000 bankroll, odds of +150, and a 45% estimated win chance, the calculator shows how much to bet to maximize expected growth.

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