Expected Value (EV) in Sports Betting: How to Find Value Bets

Expected Value is a somewhat trendy term in sports gambling that is used frequently. Some bettors use it accurately, but many others use it to appear as experts—however, the term itself is not complicated.

Expected value comes down to practical application and simple understanding.

Also known as EV, expected value measures the probability gap between a bettor’s expectations and the sportsbook’s implied expectations.

Oddsmakers assign probability through betting lines, including moneylines, point spreads, totals, futures, and props.

Expected Value in simple terms:

• Are you getting better odds than you should?
• If yes → value bet
• If not → no value

What Is Expected Value in Sports Betting?

EV betting begins with implied probability, which is derived directly from the odds.

If the Kansas City Chiefs are 10-point favorites against the Denver Broncos, the implied probability suggests a comfortable Chiefs win.

If the Dallas Cowboys are a 1-point underdog against the Philadelphia Eagles, the implied probability reflects a tight matchup.

Bettors then compare that implied probability with their own projection to determine if value exists.

In simple terms, the question is: does one team have a higher probability of covering than the odds suggest?

Simple read:

• Your probability > sportsbook → value
• Your probability < sportsbook → no value

How to Calculate Expected Value (EV) Step by Step

Calculating EV means identifying the most probable outcome and comparing it to the price offered.

This includes evaluating team strength, recent form, injuries, and matchup history.

The key step is comparing your projected odds to the sportsbook’s line. The bigger the gap, the greater the potential expected value.

Expected Value Formula (Simple Breakdown)

The formula to determine EV is not as complicated as many make it out to be. Specifically, the expected value formula is the probability of a win versus the potential profit or the probability of a loss against the stake.

EV Formula:
EV = (Probability of Winning × Profit) – (Probability of Losing × Stake)

The greater the potential profit and expected profitability, the more favorable the expected value is. Conversely, the smaller the probability and expected profit, the less expected value is offered.

Expected Value Example: Finding a +EV Bet

For example, consider an MLB matchup.

The New York Yankees are priced at -178, while the Boston Red Sox are +150. If you determine the Red Sox have a 45% chance to win (true odds closer to +122), the +150 price offers value.

EV = (.45 × 30) – (.55 × 20) = 2.50

This is a positive expected value.

While the profit is small, consistently finding these edges adds up over time.

Most +EV advantages fall in the 1–3% range, though larger edges occasionally appear and are typically targeted more aggressively by experienced bettors.

Why Expected Value (EV) Matters for Bettors

Expected value focuses on price rather than teams. The goal is to secure the best odds relative to the true probability of an outcome.

Casual bettors often focus on narratives, teams, and public perception, while sharper bettors prioritize value and pricing inefficiencies.

Over time, consistently identifying discrepancies between true probability and sportsbook odds is what drives profitability.

Positive vs Negative EV Bets: What to Look For

A positive EV bet offers better value than the odds suggest, even if individual bets lose.

Negative EV bets, on the other hand, provide worse value and lead to long-term losses.

Quick comparison:

Positive EV

• Better odds than true probability
• Long-term profit potential

Negative EV

• Worse odds than true probability
• Long-term losses

How to Find +EV Bets

Betting on positive EV consistently increases the likelihood of long-term success.

The approach involves identifying mispriced lines and avoiding wagers with poor expected returns.

Over time, this also improves a bettor’s ability to spot value and beat closing lines.

Simple checklist:

• Compare your projected odds vs sportsbook odds
• Look for probability gaps
• Avoid overpriced favorites
• Focus on long-term results

Use Implied Probability to Spot Value

To determine the implied probability of a sports bet, you can use a formula similar to what was previously outlined here to convert the odds into percentage form. This tells you the likelihood of an outcome in relation to the other options, at least as far as the numbers are concerned.

Implied probability can help you place the odds in a better perspective and improve your overall understanding of betting markets.

Track Closing Line Value (CLV)

Tracking closing line value (CLV) is simpler than you may think.

First, record the odds when you place your bet. Next, before the game starts, check the closing line at a sharp sportsbook such as Prime Sportsbook. Finally, compare the two numbers — if your bet had better odds than the closing line, you had positive CLV.

While individual bets will always vary, consistently beating the closing line is a sign that you have an edge over the market.

Bettors can apply expected value strategies by comparing odds, tracking line movement, and identifying value opportunities directly on Prime Sportsbook.