Kelly Criterion Calculator
Apply the Kelly formula to any price and probability estimate.
Kelly Fraction
8.33%
Full Kelly Amount
$83.33
Expected Value
+12.50%
Fractional Kelly Options
Fractional Kelly scales the full Kelly result down to reduce variance.
| Strategy | Fraction | Stake | % of Bankroll |
|---|---|---|---|
| Strategy: Full Kelly | Fraction1x | Stake$83.33 | % of Bankroll8.33% |
| Strategy: Half Kelly | Fraction0.5x | Stake$41.67 | % of Bankroll4.17% |
| Strategy: Quarter Kelly | Fraction0.25x | Stake$20.83 | % of Bankroll2.08% |
| Strategy: Eighth Kelly | Fraction0.125x | Stake$10.42 | % of Bankroll1.04% |
How It Works
The Kelly Criterion gives the bankroll fraction that maximizes long-term growth, based on the gap between the price and the probability estimate.
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