Kelly Calculator: Calculate Kelly Criterion Staking in Seconds

Paul Skidmore
Last Updated on Mon Jun 29 2026
Reviewed By Vinolin Naidoo

The Kelly calculator is the perfect tool to help bettors evaluate the optimal size of their next bet. The calculator leverages an advanced mathematical formula to predict the best fraction of your bankroll to attribute to your desired bet.

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Kelly calculator

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This Kelly Calculator is designed to help sports bettors understand how much of their bankroll they should wager based on their edge on a specific selection. In theory, the higher the edge a bettor feels they have, the more of their bankroll they should wager, but Kelly criterion can often suggest sums which are too aggressive. With this in mind, you can select a smaller fraction of the Kelly criterion to work with. For example, opting for half or a quarter Kelly may be the optimal way for bettors to approach their wagers and minimize the risk of ruin.

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