Kelly criterion calculator
How much of your bankroll a bet is worth, with fractional Kelly.
Results appear as you type.
For education only — not betting advice.
How it works
What is the Kelly criterion?
Kelly sizes a bet by your edge: stake fraction = (b·p − q) ÷ b, where b is decimal odds − 1, p your win probability and q = 1 − p. Most bettors use a fraction of Kelly to cut risk.
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