Expected Value (+EV) in Sports Betting

Expected value (EV) estimates the average mathematical outcome of a decision if the same probability-and-payout situation could be repeated many times. Positive EV is not a promise that an individual bet will win.

The basic idea

One simple form is: EV = (probability of win × net win) − (probability of loss × loss).

Suppose you risk $100 to win $100 and estimate a 55% chance of winning. EV = (0.55 × $100) − (0.45 × $100) = $10. That is a model-based expectation, not a guaranteed $10 profit.

The hard part is the probability

The arithmetic is easy; estimating a well-calibrated probability is difficult. Bad inputs, overfitting, injuries, market changes and model error can turn an apparent edge into no edge at all.

Next: learn implied probability, then connect EV to bankroll management.

Educational information only. Sports betting involves financial risk and may be restricted where you live. No page on this site guarantees profit or a winning outcome.