What is the Kelly Criterion?

A formula for the optimal bet size that maximises long-term bankroll growth: f = (b·p − q) ÷ b, where b = odds−1, p = win chance, q = 1−p.

Should I bet full Kelly?

Many bettors use half-Kelly to cut variance while keeping most of the growth.

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Kelly Criterion Bet Size Calculator

Work out the mathematically optimal bet size for a given edge using the Kelly Criterion.

Bankroll Decimal odds Your win probability %

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