How to Calculate Expected Value in Sports Betting 2026

Expected value (EV) is the single concept that separates disciplined bettors from gamblers. A positive-EV bet is one where your estimated probability beats the odds' implied probability. Here is exactly how to compute it in 2026.

Step 1: Convert Odds to Implied Probability

Every price encodes a probability. For decimal odds, implied probability is 1 divided by the decimal odds. For American odds, the formula differs for favorites and underdogs. A scientific calculator makes this fast and error-free every time.

Step 2: Account for the Vig

The two sides of a market sum to more than 100 percent; that overround is the sportsbook's margin. To judge a bet honestly, compare your probability to the fair, vig-removed implied probability, not the raw number.

Step 3: Estimate Your Own Probability

Your edge exists only if your estimate is more accurate than the market's. This is the hard part and where market understanding from The Logic of Sports Betting matters most.

Step 4: Compute EV

EV equals (your probability times the profit on a win) minus (probability of losing times the stake). If EV is positive at the price offered, the bet has long-term value. If not, pass, no matter how appealing.

Step 5: Bet Only Positive EV, Sized in Units

Making +EV the gate, and sizing in fixed units, is the entire discipline. Most losing bettors skip the math and bet on feel.

FAQ

What is a +EV bet? One where your estimated win probability exceeds the fair implied probability of the odds offered.

Do I need to remove the vig? Yes. Comparing to raw implied probability overstates the book's fairness and your edge.

Does +EV guarantee a win? No. It means long-term value; any single bet can lose. Always bet responsibly.

Conclusion

Make EV the gate using a scientific calculator and the market logic in The Logic of Sports Betting. Never stake more than you can afford to lose.