Why does CLV matter more than my win rate?

Because it converges much faster. Win rate needs thousands of bets to separate a real edge from variance; CLV gives you a reading on every bet whether it won or lost. A hundred bets of consistent positive CLV is stronger evidence than a hundred winning bets.

I beat the close all season and still lost. What went wrong?

Probably nothing. Positive CLV means you were getting the better of the price, not that the results had to follow within your sample. If the CLV is genuine and the sample is small, keep going — that is what edge looks like from the inside.

Which closing price should I use?

Ideally the closing price at a sharp, high-limit book — that is the number carrying the most information. Comparing against the close at a soft book where you got a promotional price flatters your CLV and tells you less.

How do I track CLV on spreads and totals?

You have to record both the number and the price. Taking +3 at −110 and seeing it close +1.5 at −110 is a large gain that shows as zero price CLV. Convert the line move into cents using a points-to-price chart for the sport, then add it to the price movement.

Consistently positive at all is good. Averaging 1–2% against sharp closing lines over hundreds of bets is a serious, professional-grade result. Averaging much more than that usually means the comparison book is soft rather than the edge being enormous.

Closing Line Value Calculator

Did you beat the number the market closed at? Over a season, that answer predicts your results better than your results do.

Price you took

The number in your bet slip.

Closing price

The same selection at the same book, right before kick-off.

Stake

Optional — shows what the better price is worth in cash.

Both prices must be the same selection on the same market. On spreads and totals the number itself usually moves too, and a price comparison alone will not capture that — taking +3 at −110 and seeing it close +1.5 at −110 shows zero price CLV while representing a large gain.

Closing line value

+5.00%

You got a better number than the market settled on. Over a large sample that is the strongest available evidence that your process is finding something — considerably stronger than your win rate.

Beat the close: Yes
Your implied probability: 47.62%
Closing implied probability: 50.00%
Market movement: +2.38%
Extra profit if it wins: +$10.00
Decimal taken vs closed: 2.100 → 2.000

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What is closing line value?

Closing line value, or CLV, measures whether the price you took was better than the price the market settled at before kick-off.

The closing line is the sharpest number a market produces — every injury, lineup and informed dollar has been priced into it. Beating it consistently means you are consistently ahead of the best estimate available.

It matters because it converges far faster than your win rate. Two hundred bets cannot separate a real edge from luck, but CLV gives a reading on every bet whether it won or lost, which is why serious bettors track it instead of results.

How it works

The closing line is the last price before an event starts, and it is the sharpest number a market produces. Every piece of information — injuries, weather, lineups, and every dollar from every informed bettor — has been priced into it. Nothing else about a market is as good a probability estimate.

So if you consistently take prices better than the close, you are consistently ahead of the best estimate available. That is what closing line value measures, and it is the single most reliable indicator of whether a betting process works.

Why it beats looking at your record: variance. Two hundred bets is a large sample by most bettors’ standards and still nowhere near enough to separate a 2% edge from luck — a losing stretch of that length is entirely normal for a winning bettor. CLV converges far faster, because you get a reading on every bet regardless of whether it won. A hundred bets of consistent positive CLV says considerably more than a hundred bets of positive results.

The caveats are real. CLV is a diagnostic, not a payment: you can beat the close all season and still lose money, and that is normal within a small sample. It only works against a genuinely liquid closing market — the close on a low-limit prop is not an efficient estimate of anything. And on spreads and totals the price alone is misleading, because the number usually moves too: taking +3 and watching it close +1.5 is a large win that shows as zero price CLV. Track the line and the price together on those markets.

The formula

price CLV = decimal taken / decimal closing − 1

probability movement
  = 1/closing − 1/taken     (percentage points)

  took +110 (2.10), closed +100 (2.00)
  → 2.10 / 2.00 − 1 = +5.00%
  → implied moved 47.62% → 50.00%, +2.38 pp

beat the close ⟺ decimal taken > decimal closing

Price CLV compares the two decimals. The probability figure is the same movement in points, which compares more sensibly across favourites and longshots.

A worked example

You bet a side at +110 on Tuesday. By kick-off the same selection is +100.

Price CLV is 2.10 / 2.00 − 1 = +5.00%. In probability terms the market went from implying 47.6% to implying 50.0%, so it moved 2.4 points toward your side after you were on it.

On a $100 stake, the better number is worth an extra $10 on the occasions the bet wins. That is the immediate value. The larger value is the signal: whatever led you to that bet identified something the market had not yet priced, two days before the market did.

Now the honest part. The bet can still lose. A season of +3% average CLV can still finish down, and frequently does at typical bet volumes. CLV tells you the process is sound; it does not tell you this month will be.

Common questions

Why does CLV matter more than my win rate?: Because it converges much faster. Win rate needs thousands of bets to separate a real edge from variance; CLV gives you a reading on every bet whether it won or lost. A hundred bets of consistent positive CLV is stronger evidence than a hundred winning bets.
I beat the close all season and still lost. What went wrong?: Probably nothing. Positive CLV means you were getting the better of the price, not that the results had to follow within your sample. If the CLV is genuine and the sample is small, keep going — that is what edge looks like from the inside.
Which closing price should I use?: Ideally the closing price at a sharp, high-limit book — that is the number carrying the most information. Comparing against the close at a soft book where you got a promotional price flatters your CLV and tells you less.
How do I track CLV on spreads and totals?: You have to record both the number and the price. Taking +3 at −110 and seeing it close +1.5 at −110 is a large gain that shows as zero price CLV. Convert the line move into cents using a points-to-price chart for the sport, then add it to the price movement.
What is good CLV?: Consistently positive at all is good. Averaging 1–2% against sharp closing lines over hundreds of bets is a serious, professional-grade result. Averaging much more than that usually means the comparison book is soft rather than the edge being enormous.

The guide behind this calculator

Closing Line Value: The Only Fast Feedback in BettingResults take thousands of bets to mean anything. Beating the closing price tells you something after a few dozen.9 min read

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For informational and analytical purposes only. These tools do not predict outcomes and do not recommend wagers.