What closing line value tells you
A line moves from open to close as news arrives and money comes in. By game time it reflects almost everything the market knows, which makes the closing price the best single estimate of a bet’s true chances. Closing line value (CLV) compares your price with that estimate.
Say you bet a side at +120. At the close both sides are −110, so the market’s no-vig estimate is 50%. Your +120 only needed to win 45.45% of the time to break even, so you beat the close by about 4.5 percentage points. If the closing 50% is right, you expect to make $10 for every $100 bet.
Expected return = closing no-vig probability × your decimal odds − 1
Line CLV
For spreads and totals, CLV can also be counted in points. Bet an NBA over at 224.5, watch it close at 227.5, and you got three points of value: the market ended up expecting more scoring than your number. A point is worth more in some places than others. In the NFL, final margins land on 3 and 7 far more often than other numbers, so moving across them matters most. NBA scores are more spread out, so each point is worth less, but a three-point move on a total is still meaningful.
Why professionals track it
- It’s faster than results. Win-loss records over a few dozen bets are mostly luck. CLV gives a useful signal much sooner.
- It measures the price, not the outcome. A bet that beat the close and lost was still a good bet at that price.
- It isn’t a guarantee. Closing lines are very good estimates, not perfect ones, and single bets that beat the close lose all the time.
To track CLV, record your price and the closing prices on both sides for every bet. Over hundreds of bets, consistently beating the close is one of the best signs that your numbers are better than the market’s. More in Opening Lines vs. Closing Lines.
Frequently asked questions
What is closing line value?
Closing line value (CLV) measures how the price you bet compares with the final price before the game. Beating the closing price means you got a better number than the market’s final estimate.
How do you calculate CLV?
Remove the vig from the closing prices on both sides to get the closing fair probability, then compare it with the break-even probability of your price. A bet at +120 that closes at −110 on both sides has a fair probability of 50% against a break-even of 45.45%, about 4.5 points of CLV and a 10% expected return if the close is right.
Does beating the closing line guarantee profit?
No. Single bets that beat the close still lose often. CLV is evidence over many bets that your prices are better than the market’s, which is why bettors track it.