Calculate the ideal bet size, given the percent chance of favorable outcome, and the odds/multiplier!

This calculator uses the Kelly Criterion to calculate the ideal bet size: both a dollar amount for your bet, and the percentage of your bankroll. The calculator can also adjust your bankroll whether you win or lose, so you can always know the exact amount to bet!

equivalent to the value on the left side of fractional odds when the value on the right side is 1. To illustrate, consider a bet with odds of 2/1; in this case, the payout odds would be 2. If you win double your bet, your odds are 2.

In terms of decimal odds, this can also be interpreted as subtracting one from the decimal odds.

To provide an example, if you wagered 25 units and emerged victorious, your total funds would be 75 units—this comprises your initial bet along with your winnings.

This app does not contain any financial advice.