Determine the long-term profitability of any bet. Identify positive expected value (+EV) opportunities instantly.
Enter your bet details and estimated true win probability to calculate EV and ROI.
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Expected Value (EV) represents the average amount you expect to win (or lose) per bet if you placed the same wager repeatedly over time. Positive EV (+EV) bets are profitable long-term, while negative EV bets lose money over time.
The formula is: EV = (Win Probability × Profit on Win) - (Loss Probability × Stake)
Professional bettors only place +EV bets to ensure long-term profitability, regardless of short-term variance.
This tool helps you evaluate any single bet for long-term value by comparing the sportsbook odds to your estimated true probability (often derived from no-vig fair odds or sharp lines).
When you discover multiple +EV single bets, consider combining them strategically. Our multi-leg Parlay Calculator lets you input custom odds for each selection, instantly showing combined payouts, total risk, and potential returns—allowing you to build high-value parlays from individually positive EV legs for amplified long-term edge.