What is closing line value (CLV) in sports betting?
Closing line value is the difference between the price you bet and the price the market closes at. Take an over at −110 in the morning, watch it close at −150, and you captured closing line value: you bought a 60% probability at a 52.4% price. The closing price matters because it is the market’s final, most-informed estimate — every lineup confirmation, weather report, and respected bet is baked into it.
CLV is measured in probability points or in expected value. Convert your price and the close to implied probabilities and subtract: 60.0% − 52.4% = +7.6 points of CLV. Or price your ticket against the close’s fair probability: a −110 ticket on a 60% event is worth +14.5% per dollar. Either way, positive CLV means the market moved onto your side after you bet.
Why CLV grades your process
Individual bets are decided by variance; CLV is decided by whether you consistently bet before the information arrives. A bettor who beats the close week after week is demonstrating that their numbers see the market earlier than the market does — and beating the close correlates with long-run profit about as well as anything measurable. A bettor who never beats the close is paying retail and will lose to the vig over time, whatever their recent record says.
One caveat keeps it honest: CLV on any single bet is noisy too. Lines sometimes move for reasons unrelated to your side, and small samples of CLV prove little. Judge it across hundreds of bets, the same way you would judge results.
How to capture it
Bet early into numbers you believe are wrong, at the best available price, and record what you took versus what it closed at. That is the entire discipline. The OddsGuy board exists to surface those mispriced numbers before the market finishes correcting them.
Worked example — beating the close
- Your price: −110
- implied 52.4%
- Closing price: −150
- implied 60.0%
- CLV in probability points
- 60.0% − 52.4% = +7.6pp
- Your ticket priced at the close’s fair
- +14.5%
- If you had chased at −150 instead
- you need 60.0% just to break even
Same over, same game, same result — the −110 ticket holds +14.5% of expected value that the −150 ticket never had. Price is the bet.
See it live
Related terms
Frequently asked questions
Is positive CLV a guarantee I will win?▾
No. CLV says nothing about one bet’s outcome — it says you bought a better price than the market’s final estimate. A +7-point CLV ticket still loses whenever the under hits. CLV pays out over hundreds of bets, where consistently beating the close turns into realized profit.
How much CLV is good?▾
Any consistent positive number is meaningful, because the close is a hard benchmark to beat. Bettors who average +2 points or more of CLV across a large sample are beating the market by a real margin. Occasional big beats — +5 points or more — usually mean you bet before real news broke.
Can I have good CLV and still lose money?▾
Over small samples, easily — variance decides short runs. Over large samples, sustained positive CLV and profit converge, because the closing price is the best available estimate of true probability. If you keep buying 60% events at 52% prices, the math eventually pays you.
Does CLV apply to player props or just game lines?▾
It applies anywhere prices move, and props move plenty — a hot streak or a lineup note can drag a strikeout line from −110 to −140 by first pitch. Prop closes are noisier because fewer sharp bettors are involved, which makes an early, well-priced number even more valuable.
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