Free tool

Kelly Criterion

Size into edge with discipline by converting your bankroll, edge, and price into a percentage stake recommendation.

Core formula

Kelly = ((odds - 1) x p - q) / (odds - 1)

Kelly sizing

Bankroll (AUD)Decimal oddsEstimated win probability (%)

Output

Kelly fraction10.27%

Full Kelly stake$256.82

Half Kelly stake$128.41

Kelly is a bankroll management tool, not a signal generator. If the estimate behind the edge is weak, size down.

Use Notes

Many bettors use fractional Kelly to reduce volatility.

A negative Kelly result means there is no theoretical edge at the current price.