Expected Value Calculator
Calculate EV & Kelly Sizing
Determine the expected value of your sports bets and get Kelly Criterion recommendations for optimal bet sizing. Free tool for profitable betting.
EV Calculator
Interpretation
This bet has zero expected value. No edge for either side.
EV Formula
EV = (Probability × Win Amount) - (1 - Probability) × Bet AmountKelly Criterion: f = (bp - q) / b (using 25% fractional Kelly for safety)
How to Use the EV Calculator
Step-by-Step Guide
Enter Your Bet Amount
Input how much you plan to bet in dollars
Add the Odds
Enter American odds (e.g., +150 or -110)
Estimate Probability
Enter your estimated win probability as a percentage
Review Results
Check EV, Kelly recommendation, and interpretation
Understanding the Results
Positive EV (+EV)
You have a mathematical edge. This bet will be profitable long-term.
Negative EV (-EV)
The sportsbook has the edge. Avoid this bet to protect your bankroll.
Kelly Criterion
Optimal bet size recommendation using 25% fractional Kelly for safety.
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