The Kelly criterion helps maximize the average growth rate of your betting bankroll. Unlike many other betting methods, the Kelly bet calculation also considers the probability of winning. 

It is deceptively easy to enter the odds and probabilities into the calculator and think that the bankroll is now growing optimally. Of course, this would be the case if the estimates were always equally good, but in reality something is always missed and not calculated. For this reason, the Kelly bet should be scaled down depending on the situation. This can be done by increasing the bet divider.