NBA
MLBClosing-Line Value
Closing-line value measures how smart you were the day you placed the bet, not how lucky you got. It is the one number that grades a betting process while the variance is still washing out — and the reason a winning ticket can still be a losing decision.
What closing-line value is
CLV is the gap between the price or line you bet and the price or line the market closed at.
Every market drifts toward a final number the moment the whistle nears — the close. By then the wisest money has spoken, and that closing line is the sharpest public estimate of true probability anyone will ever publish on the event. If you bet a number the market later agreed was good and drifted toward, you captured positive CLV. If it drifted away from you, you bet the worse number, full stop, no matter how the game ended.
That last clause is the whole point. A bet's CLV is fixed the instant the line closes. The game can still hand you a win or a loss, but it cannot retroactively make a bad number good. Treat CLV as the scoreboard for the decision, and the win/loss column as the scoreboard for the night.
Why CLV beats win rate in the short run
Win rate is mostly noise until your sample is enormous; CLV is signal from the first bet.
Over fifty plays, a 53% bettor and a 47% bettor are statistically hard to tell apart — variance swamps the difference. But their CLV separates them almost immediately. Beat the close by a point or two per bet and you are, by definition, betting numbers the market keeps validating; do that across a few hundred plays and the win rate has nowhere to go but toward the edge you have already proven.
CLV is the only edge metric that compounds before the results arrive. It is why a sharp tracks it obsessively and a square never mentions it: one is grading the process, the other is grading the luck.
The formula
For a total or spread, CLV is the move in the number, expressed against the close. For a moneyline or price-based market, CLV is the move in implied probability. The points form is the one most bettors carry in their head:
CLV% = (your_line − closing_line) ÷ closing_line × 100That signs correctly for an Over (you want the close above your number) when you flip the subtraction for the Under. The price form removes the ambiguity entirely by working in probability — the language the engine actually speaks:
CLV% = (implied_close − implied_yours) ÷ implied_yours × 100One ticket, two scoreboards
You bet Josh Allen Over 250.5 passing yards at −110 on Thursday. By kickoff the market has climbed: the close sits at 262.5, juiced to −120 because the sharp money piled onto the Over. Allen throws for 262.
Your ticket cashes — 262 clears 250.5 with room. But look at what the market did with your number. It moved away from your side: by the close, the Over you bought at 250.5 was a 12-point bargain the rest of the market never got. In points terms, you sat on the wrong side of a line that drifted up and through your result.
Bet Over 250.5 @ -110 (implied 52.4%)
Close Over 262.5 @ -120 (implied 54.5%)
Result 262 yards -> ticket WINS
Points CLV (250.5 - 262.5) / 262.5 x 100 = -4.6%
(you bought the number the market priced richer)
Verdict WIN on the night, LOSS on the decision.
A -4.6% CLV bet you'd be thrilled to keep repeating
is the opposite of what you want.Flip it: had you bet the same Over at 250.5 and the close fallen to 244, your ticket might lose — but the +CLV would tell you the process was sound and the variance simply collected. Repeat that bet a thousand times and you win.
The sharp reference market
CLV is only meaningful against a closing line you trust to be sharp.
Not every closing price is created equal. A low-limit recreational book's close is a soft estimate; a high-limit market or a betting exchange's closing midpoint is the consensus of the people who move the most money and can least afford to be wrong. Those are the references worth grading against — books like Pinnacle and the major exchanges close the sharpest, lowest-margin numbers in the market, which is exactly why they make the cleanest yardstick.
The honest move is to strip the vig out of that sharp close first. A raw −120/+100 market still carries the book's margin; de-vigged, it resolves to the true probability the sharp money settled on. CLV graded against a de-vigged sharp close is the closest thing betting has to an objective referee.
How we grade CLV
When the +EV engine surfaces a pick, it stamps the offered price, the de-vigged fair probability, and the sharpest anchor available at that moment — an exchange's no-vig midpoint where one exists, otherwise a de-vigged consensus of the highest-limit books. After the event commences, a settlement job captures the closing price at the same book and tier the pick was flagged on and computes realized CLV against it.
Grading against the same book the pick was flagged on is deliberate: it measures a number you could actually have captured, not a theoretical best price you never had access to. The result is published, unedited, in the public ledger — wins, losses, and the CLV on every one.
We never publish a CLV figure we cannot trace to a settled offer. When the sample is still small, the ledger says so plainly and shows the methodology rather than a flattering average — an honest track record builds in public or not at all.
CLV, answered
A good closing-line value is consistently positive — most sharp bettors target an average of +1% to +2% across hundreds of plays. The exact bar is market-dependent: low-vig sides need less CLV to prove an edge than high-hold player props, where +3% or better is a stronger signal.