Kelly criterion calculator

The Kelly criterion computes the stake that maximises long-run bankroll growth: stake share = (b·p − q) / b, where b is decimal odds minus 1, p is your win probability and q = 1 − p. Full Kelly assumes your probability estimate is perfect, which it never is, so serious bettors use half or quarter Kelly.

Decimal oddsYour win probability, %Bankroll

Full Kelly: 10.0% of bankroll = 10.00
Half Kelly (recommended): 5.0% = 5.00
Quarter Kelly (conservative): 2.5% = 2.50

18+. No staking plan turns a losing edge into a winning one; bet responsibly.