Definition
Closing Line Value (CLV) measures the difference between the odds at which you placed your bet and the closing line -- the final odds offered just before an event starts. It is widely regarded as the single best predictor of long-term profitability in the professional betting world.
How It Works
The closing line is considered the most efficient odds available because it incorporates all known information (team news, injuries, weather, betting volume). If you consistently secure odds higher than the closing line, you are a profitable bettor over time. The formula is: CLV = (Odds Taken / Closing Odds - 1) x 100.
Example
You bet on Team A to win at odds of 2.30 on Monday. By kickoff on Friday, the odds have dropped to 2.05.
CLV = (2.30 / 2.05 - 1) x 100 = 12.2%
You captured 12.2% of extra value compared to the efficient market price. Even if this particular bet loses, your selection process is demonstrably strong.
Why It Matters
A consistently positive CLV is mathematical proof of an edge. Bookmakers use CLV internally to identify and limit sharp bettors. A bettor can have a 45% win rate and still be highly profitable thanks to strong CLV. Over a sample of 500+ bets, CLV is a far more reliable indicator of skill than win rate alone. To improve your CLV, bet early when lines are less efficient, shop odds across multiple bookmakers, and specialize in niche markets.
Track your opening and closing odds on BettingTracker. A positive average CLV over 500+ bets confirms you have a real, sustainable edge.