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Unit Sizing (Kelly) Calculator
Use your true probability to size bets with discipline. Fractional Kelly is recommended.
American Odds
Your True Probability (%)
Bankroll ($)
Kelly Fraction (safer)
1.00 (Full Kelly)
0.50 (Half Kelly)
0.25 (Quarter Kelly)
0.10 (Tenth Kelly)
Calculate Sizing
Notes: Kelly can be aggressive. Fractional Kelly reduces volatility. If your edge estimate is wrong, Kelly overbets.