Kelly Calculator

Calculate optimal bet sizing using the Kelly Criterion formula. Maximize profit while minimizing risk of ruin by determining the mathematically optimal percentage of your bankroll to wager.

Your Bet

Sportsbook Odds The odds offered by the sportsbook

Odds Format

Fair Win Probability

Fair Win Percentage (%) Use no-vig fair odds from sharp sportsbooks or your model's prediction

Bankroll

Total Bankroll ($) The total amount you're willing to risk

Kelly Fraction (Optional)

Kelly Fraction Conservative approach to reduce volatility

Kelly Criterion Results

Kelly Calculation

Kelly Percentage: -

Adjusted Kelly Percentage: -

Recommended Bet Amount: -

Bet Recommendation: -

Expected Value Analysis

Expected Value: -

EV Percentage: -

Edge: -

Implied Probabilities

Sportsbook Implied Probability: -

Fair Win Probability: -

Probability Difference: -

Risk Analysis

Bankroll Risk: -

Remaining Bankroll: -

Risk Level: -

Profit Potential

Potential Profit: -

Potential Loss: -

Profit/Loss Ratio: -

Kelly Criterion Tips

🎯 What is Kelly Criterion?

A mathematical formula that determines the optimal bet size to maximize long-term growth while minimizing risk of ruin.

📊 Kelly Fraction Strategy

Use fractional Kelly (Half, Quarter, Tenth) to reduce volatility and protect your bankroll from large swings.

✅ When to Use Kelly

Only use Kelly when you have positive expected value (+EV) bets. Negative EV bets should be avoided entirely.

💰 Bankroll Management

Your bankroll should be money you're comfortable losing. Most bettors start with $5,000-$25,000.