1. The Concept of Value and Positive Expected Value (+EV)
Bookmakers set odds based on what they believe is the likelihood of an event, plus a margin (vig). Value exists when you believe the bookmaker's probability assessment is slightly off, and the odds they offer are more favorable than they 'should' be based on the true likelihood. This discrepancy represents your potential "edge."
A bet with positive expected value (+EV) is one that, on average, is expected to return a profit over a large number of identical bets. Value betting is synonymous with +EV betting.
2. Calculating Value and Expected Value (EV)
To identify value, you need to compare the bookmaker's implied probability (derived from their odds) with your own estimated true probability of the event. If your estimated probability is higher than the implied probability, the bet has value.
Calculating Implied Probability (using Decimal Odds):
Implied Probability (%) = (1 / Decimal Odds) * 100
Example: Odds of 2.50 = (1 / 2.50) * 100 = 40% Implied Probability
Learn more about converting odds on our Understanding Betting Odds page.
Calculating Expected Value (EV):
EV = (Your Estimated Probability) * (Decimal Odds - 1) - (1 - Your Estimated Probability) * 1
Or simply: If (Bookmaker Odds * Your Estimated Probability) > 1, the bet has value (+EV).
Example: Odds 2.50 (40% Implied). Your Estimated Probability: 50%
(2.50 * 0.50) - (1 - 0.50) * 1 = 1.25 - 0.50 = +0.75
Alternatively: (2.50 * 0.50) = 1.25. Since 1.25 > 1, this is a +EV bet.
This means for every $1 wagered, you'd expect to profit $0.25 on average over many identical bets.
Your key challenge is accurately estimating the true probability, which requires thorough analysis.
3. Finding Value Bets with Data and Analytics
Accurately estimating true probabilities is difficult through intuition alone. This is where data analytics becomes crucial. By using statistical models to analyze historical data, player performance, matchups, and other factors, you can generate objective probability estimates that are more reliable than gut feelings.
How Bet Better Helps: Bet Better specializes in this. Our advanced data science and AI/ML models generate objective probability projections for sporting events. We then compare these projections to real-time bookmaker odds to automatically identify and flag bets with positive expected value. Our "Best Bets" are essentially our identified value bets.
4. Consistency and Bankroll Management
Value betting is a long-term strategy. You won't win every value bet, as variance is a natural part of gambling. However, by consistently placing bets where the odds are in your favor, the law of large numbers suggests you should be profitable over time. This requires patience and disciplined bankroll management to withstand losing streaks.
Focus on the process of finding value, not the outcome of single bets.
Conclusion: Value is Your Path to Profit
Value betting is not a get-rich-quick scheme, but a disciplined, mathematical approach to sports betting. By learning to identify when bookmaker odds offer a favorable price relative to the true probability, you gain a significant edge. Leveraging data-driven tools and analytics, like those provided by Bet Better, simplifies the process of finding these crucial value opportunities, setting you on the path to long-term profitability.
Ready to stop guessing and start finding value? Explore Bet Better Subscriptions and access the data and insights that power successful value betting.