Kelly criterion calculator
How much of your bankroll to stake, from the odds and your own probability of the outcome.
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How the Kelly criterion works
The Kelly formula sizes a stake from your edge: stake share = (probability × odds − 1) ÷ (odds − 1). With odds of 2.10 and a probability of 52%, full Kelly is about 8.4% of the bankroll. When the odds imply a higher chance than yours, there is no edge and Kelly says not to bet.
Full Kelly swings hard, and your probability is only an estimate. Most bettors use half or quarter Kelly, or a fixed stake of 1% to 2% of the bankroll. Read more about units and bankroll in the glossary.
More tools: Bet calculator · Hedge calculator · Odds converter · Implied probability calculator · Parlay calculator
21+ (18+ where the legal age is 18). Model estimates and statistics are information, not a promise of any result. Bet only what you can afford to lose. Problem gambling help: 1-800-GAMBLER.
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