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Kelly Criterion Stake Calculator

Calculate the mathematically optimal bet size to maximize bankroll growth using the Kelly formula, with Full, Half and Fractional Kelly sizing as a percentage of bankroll.

Bookmaker Odds (Decimal) Your True Win Probability (%) Kelly Multiplier (Optional, Default 1.0 for Full Kelly)

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✨ Key Capabilities

Full Kelly, Half Kelly, and Fractional Kelly sizing
Detects positive expected value (+EV) edges
Provides percentage-of-bankroll recommendations

📖 How to Use the Kelly Criterion Stake Calculator

Enter the decimal odds offered by the bookmaker.
Enter your estimated true win probability (%).
Optionally enter a Kelly multiplier (e.g., 0.5 for Half Kelly).
Click Calculate to view your optimal bankroll stake.

❓ Frequently Asked Questions

Why use Half Kelly instead of Full Kelly?

Half Kelly significantly reduces portfolio volatility and downside drawdowns while still capturing substantial long-term growth.

Can I use Half Kelly or Fractional Kelly?

Yes. The tool supports Full Kelly, Half Kelly and Fractional Kelly sizing, and gives a percentage-of-bankroll recommendation based on your estimated true win probability.