Free odds tools
Kelly calculator
Use your own probability estimate with a price and bankroll to see a full, half or quarter Kelly stake.
Inputs
Suggested stake
Full Kelly bankroll shareNot available
Applied bankroll shareNot available
Prices on this page can be prefilled from the OddsLink API.
Bring live prices into your workflow.
Use the OddsLink API to get prices from the books you follow in one response shape.
Frequently asked questions
What is the Kelly criterion?
It is a formula that uses price and your own win probability to suggest a fraction of bankroll.
What probability should I enter?
Use your own estimate of the chance to win, not the market's implied probability.
What is half Kelly?
It takes half of the full-Kelly stake, which lowers both the stake size and the variation in outcomes.
Why is my stake zero?
The formula returns zero when your probability does not support a positive stake at that price.
Does Kelly guarantee a result?
No. It is a stake-sizing formula, and the estimate you enter can be wrong.