Kelly Criterion Calculator

How much of your bankroll should you stake if you estimate an outcome's probability to be higher than the bookmaker's odds imply? The Kelly criterion links stake size to the size of that edge. Enter your bankroll, the odds and your probability estimate: the calculator will show the bankroll fraction and corresponding amount.

Try changing the probability to see how sensitive the result is to your estimate. The calculator works out the stake size; you provide the probability. If the calculation finds no edge, the Kelly stake is zero.