Understanding Expected Value (EV) in Sports Betting

Expected Value (EV) measures what a bettor can expect to win or lose per bet placed on the same odds over time. Positive Expected Value (+EV) indicates long-term profit, while Negative Expected Value (-EV) guarantees long-term losses.

Calculating EV Step-by-Step

To calculate EV:

1. Convert bookmaker odds to implied decimal probability: $P_{\text{implied}} = \frac{1}{\text{Odds}}$.
2. Estimate the true real-world probability $P_{\text{true}}$ based on team metrics, Poisson distribution, or historical data.
3. Calculate EV using: $$\text{EV} = (P_{\text{true}} \times \text{Payout}) - (P_{\text{false}} \times \text{Stake})$$

Why -EV Bets Lose Over Time

Casino games (roulette, slots) are hardcoded with negative expected value. Sports betting is unique because bookmakers set subjective lines that can be beaten through sharp analysis.

Summary Checklist for +EV Bettors

• Always calculate true probability independently from bookmaker odds.
• Focus on long-term sample sizes (500+ bets) rather than daily outcomes.
• Consistently seek the highest available odds across multiple betting platforms.