Formula / logic
For decimal odds d, net odds b = d − 1. With win probability p and q = 1 − p, Kelly fraction f = (bp − q) / b. Negative fractions are clamped to zero for the displayed stake amounts.
Sports utilities
Kelly Criterion Calculator
Apply the Kelly formula to decimal odds, bankroll and your own estimated win probability, with full, half and quarter Kelly amounts.
Calculator
Enter values
Calculation result
Result
Enter the values and calculate to see the result.
Example
At decimal 2.00 with a 55% estimated win probability, raw Kelly is 10%. On a bankroll of 1,000, full Kelly is 100 and half Kelly is 50.