Kelly Criterion Calculator
Determine the mathematically optimal percentage of your bankroll to stake on a bet, given the odds and your estimated probability of winning.
£
%
%
Use 25-50% (quarter/half Kelly) for lower variance.
Full Kelly %
8.33%
Adjusted Kelly %
8.33%
Optimal Stake
£83.33
Formula: Kelly % = (bp - q) / b, where b = decimal odds - 1, p = win probability, q = 1 - p.