Betting tools
Kelly Staking
Size a stake from your edge and bankroll.
Kelly Calculator
Size every bet for steady, controlled growth.
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Kelly fraction
Enter the odds, your estimated win chance, and your bankroll to size the bet.
How to use it
Enter the decimal odds, your estimated win probability and your bankroll. The calculator returns the Kelly-optimal fraction and the suggested stake, with a half-Kelly line for a more conservative approach.
What it means
Kelly sizing scales a stake to the size of your edge and your bankroll, balancing growth against the risk of ruin. A larger edge stakes more; a thin or negative edge stakes little or nothing. It's a discipline for sizing, not a forecast of returns.
For education only — not financial advice. 18+. Gamble responsibly. Past performance does not guarantee future results.