Commercial
Closing Line Value (CLV)
Last reviewed 24 September 2026
What is CLV?
The difference between the odds a bettor took and the market's closing odds on the same outcome. The standard proxy for whether a betting process holds an edge.
Key takeaways
- Closing line value is the difference between the odds a bettor took and the market's closing odds on the same outcome.
- The closing line is treated as the market's most efficient estimate of true probability, so beating it consistently indicates genuine skill.
- Sportsbooks use the same signal to identify sharp customers, who are commonly restricted or limited.
Why it matters
Closing line value compares the price obtained against the price available when betting closes. Backing a team at 2.20 that closes at 2.00 is positive CLV: the market moved toward the position after the bet was struck. Because the closing line reflects the maximum information and money the market absorbed, it is treated as the most efficient publicly available estimate of true probability, and beating it consistently is strong evidence of genuine predictive skill.
CLV is valued precisely because results are noisy. A bettor may be profitable over hundreds of bets through luck, or unprofitable despite a real edge, but consistent positive CLV is very difficult to produce by chance. Sportsbooks use the same signal in the other direction: customers who reliably beat the closing line are identified as sharp and are commonly restricted or limited, a practice that sits at the centre of long-running arguments about account restrictions in mature betting markets.
Frequently asked questions
What is closing line value in betting?
Closing line value, or CLV, measures the difference between the price a bettor obtained and the price available when betting on the market closed. Backing a team at 2.20 that closes at 2.00 is positive CLV, because the market moved towards the position after the bet was struck. It is the standard proxy for whether a betting process holds a genuine edge.
Why is closing line value a better measure than profit?
Betting results are noisy. A bettor can be profitable over hundreds of bets through luck, or lose despite a real edge. Consistent positive CLV is very difficult to produce by chance, because the closing line reflects the maximum information and money the market has absorbed. Serious bettors and analysts therefore treat CLV as stronger evidence of predictive skill than short-run profit and loss.
How do sportsbooks use closing line value?
Sportsbooks run the same comparison in reverse. Customers whose bets reliably beat the closing line are identified as sharp, because their prices are consistently better than the market's final estimate, and their accounts are commonly restricted or limited. The practice sits at the centre of long-running arguments about account restrictions in mature betting markets, where critics question whether licensed operators should be free to exclude winning customers.