Kelly

The Kelly Criterion is formula used to determine the optimal stake size of a series of bets, in order to maximize long term bankroll growth.

You can use the calculator below to work out how much you should be staking on each bet according to the Kelly Criterion.

For a full explanation of the Kelly Criterion and how your betting can be improved by using it, please refer to Intelligent Betting: A Fundamental Guide To Betting On Horse Racing.