Closing Line Value
The difference between your bet's price and the price the same market closed at. The most reliable indicator of long-run predictive edge.
Closing line value measures whether the price you got at bet placement was better than the price the same market settled at when betting closed. Because the closing line incorporates every piece of public and sharp information available before the event, it is the cleanest available proxy for true probability. Beating the close consistently is the gold standard for distinguishing real predictive skill from variance.
- It evaluates the quality of the decision at the moment it was made, independent of the noisy realized outcome. A sharp bettor can lose ten in a row while still playing positive expected value.
- Win-loss records on small samples are dominated by variance. CLV converges far faster, often after 50-100 bets versus the thousands needed to detect skill from win-rate alone.
- Sportsbook risk teams use CLV to identify and limit sharp action. Sustained positive CLV is the signal that gets accounts restricted at soft books.
- Sharp markets like Pinnacle and Circa are widely accepted as having no-vig closing lines that closely track true probability. Beating their close is the benchmark.
CLV = (your_decimal / closing_decimal) − 1Your decimal odds at the time you bet, divided by the closing decimal odds at the same book, minus one. Express as a percentage. The no-vig variant uses the no-vig fair closing decimal instead, computed by stripping the bookmaker's overround from both sides of the closing market.
You bet at +110 (decimal 2.10). The line closes at -110 (decimal 1.909). Raw CLV = 2.10 / 1.909 − 1 = +9.95%. If the opposite side also closed at -110, the no-vig closing decimal is 2.0, so no-vig CLV = 2.10 / 2.0 − 1 = +5.0%.
- Comparing your price to the opening line instead of the closing line. Opening lines have not absorbed sharp money yet and overstate edge.
- Reporting raw CLV when the closing market still includes vig. The correct figure for advertised edge is no-vig CLV.
- Cherry-picking which bets to track. CLV is only meaningful as a population statistic across every bet a model produced, including the negative ones.
Compute it yourself.
We built a free calculator that implements the formula above. Plug in your numbers and see the math.
Open CLV CalculatorWhat CLV target indicates a profitable model?
Sustained no-vig CLV above 1% across hundreds of bets is already evidence of real edge. Above 2-3% is strong. Above 5% across a meaningful sample is exceptional and rarely seen outside very narrow markets. Pinnacle and Circa are the standard reference closes; beating them is meaningfully harder than beating soft books.
Does positive CLV guarantee profit?
No. CLV measures expected value, not realized outcome. A bet with +5% CLV can still lose, just as a -5% CLV bet can still win. The math only converges over many bets, and the convergence requires that your CLV measurements are honest (population, not cherry-picked).
Why does the closing line work as a proxy for true probability?
Because every motivated participant with information has placed their bet by the close. Sharp markets adjust prices in response to that flow. The result is a price that aggregates the consensus of motivated, informed actors, which by financial-market analogy approximates the efficient price. Soft markets have a weaker version of this property.
How is CLV used inside a sportsbook?
Risk teams compute CLV for every bettor. Accounts with persistently positive CLV are flagged and either limited (lower stake caps) or banned. From the bettor's side, sustained positive CLV is therefore both the signal of real edge and the leading indicator of being limited at retail books.