Kelly Criterion Calculator

Determine the mathematically optimal stake size to maximize bankroll growth while avoiding bankruptcy.

How to Use This Calculator

The Kelly Criterion balances risk and reward by calculating what percentage of your bankroll to risk based on your perceived mathematical edge.

Enter Total Bankroll Input the total amount of funds set aside strictly for sports betting.
Enter Odds & Probability Enter the Decimal odds offered by the bookmaker and your estimated true win probability (%).
Select Kelly Fraction Choose Full, Half (0.5x), or Quarter (0.25x) Kelly depending on your risk tolerance.

Sharp Tip: Most professional bettors use Half (0.5x) or Quarter (0.25x) Kelly to dramatically reduce bankroll drawdown variance caused by losing streaks.

Total Bankroll ($)

Odds (Decimal)

True Win Prob (%)

Kelly Fraction Multiplier

Recommended Wager Size

$0.00

Bankroll Fraction

0.00%

Mathematical Edge

0.00%

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