Kelly Criterion Calculator
Calculate the mathematically optimal bet size for long-term growth.
Kelly Fraction
8.33%
Recommended Stake
$83.33
Expected Value
+12.50%
Fractional Kelly Options
Many bettors use fractional Kelly to reduce variance while still growing their bankroll.
| Strategy | Fraction | Stake | % of Bankroll |
|---|---|---|---|
| Full Kelly | 1x | $83.33 | 8.33% |
| Half Kelly | 0.5x | $41.67 | 4.17% |
| Quarter Kelly | 0.25x | $20.83 | 2.08% |
| Eighth Kelly | 0.125x | $10.42 | 1.04% |
How It Works
The Kelly Criterion maximizes long-term bankroll growth by sizing bets proportionally to your edge.
f* = (bp - q) / b Where: f* = fraction of bankroll to wager b = decimal odds - 1 (net odds) p = probability of winning q = probability of losing (1 - p)
See how we compare: vs The Odds API · vs BetsAPI · vs OpticOdds · vs SportsGameOdds
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