What is Kelly Criterion in betting?

Kelly Criterion is a formula that suggests stake size based on odds, edge, and bankroll.

Why use half Kelly or quarter Kelly?

Reduced Kelly staking lowers volatility and drawdowns compared to full Kelly sizing.

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Calculate suggested stake size from bankroll, odds, and your win probability estimate. Includes full Kelly, half Kelly, and quarter Kelly sizing.

Decimal odds Estimated win probability (%) Bankroll

Kelly % (full)

Edge per unit

Full Kelly Stake

Half Kelly Stake

Quarter Kelly Stake