CLV Calculator
How To Use This Calculator
Enter the odds you bet at and the closing odds on the same selection. The calculator shows how far your price beat or trailed the close. Add the other side's closing odds to strip the vig and measure CLV against the fair closing line.
The price you actually took, in decimal or American format.
The final odds available on your selection just before the event started.
Optional but recommended: add the opposite side's closing odds so the bookmaker's margin is removed from the comparison.
What Is Closing Line Value?
Closing line value (CLV) compares the odds you took when you placed a bet with the final odds available when the market closed. If your price was higher than the close, you beat the market's last and best estimate; if it was lower, the market beat you.
The close matters because it is the most informed price a market produces. By the start of the event, team news, line moves, and professional money have all been absorbed into the odds. Beating the closing line regularly means taking prices the market later confirms were too high.
Worked Example: No-Vig CLV
You bet a team at 2.50. By the start of the game the market closes at 2.30 on your side and 1.70 on the other.
Why Sharp Bettors Track CLV
Results take a long time to tell the truth. A bettor with a genuine edge still has losing months, and a bettor with no edge can run hot for hundreds of bets. CLV cuts through that noise because it grades every bet against the market's final price, win or lose.
That is why average CLV over a decent sample is widely treated as the strongest available signal of long-term profitability. If you keep beating the fair closing line, you keep taking prices the market later decides were too generous, and profit tends to follow that math.
It works in the other direction too. Winning with negative CLV usually means running hot rather than betting well. Checking CLV before trusting a streak keeps you honest about where the results actually come from.
How to Track CLV at Scale
Checking one bet is easy: note your odds, record the closing odds, run them through the calculator above. The problem is volume. Doing that by hand for every bet means capturing closing prices across dozens of markets at exactly the right moment, every day.
In practice you need tooling: at minimum a spreadsheet plus a reliable source of closing odds. Bet Hero's bet tracker records the closing line and computes CLV automatically for every bet you log.
However you track it, judge the average over a sample rather than single bets. One line move proves nothing. A few hundred bets with positive average CLV is a pattern worth trusting.
Common Mistakes to Avoid
Raw closing odds include the bookmaker's margin, which makes your CLV look better than it is. Whenever you have the other side's closing price, devig first and compare against the fair line.
A single closing line can move on noise. CLV only means something as an average across a real sample, so track it over hundreds of bets before drawing conclusions.
A soft book's close can sit far from the sharp consensus. Take your closing odds from the sharpest market you can access and use the same source consistently.
A winning month with negative CLV is usually luck. If your average CLV stays negative, expect the results to catch up with it, in the wrong direction.
Frequently Asked Questions
What is closing line value in betting?
Closing line value measures the difference between the odds you bet at and the odds available when the market closed. Positive CLV means you got a better price than the market's final assessment of the same selection.
How is CLV calculated?
Divide your decimal odds by the closing odds and subtract 1. Betting 2.50 on a line that closes 2.30 gives 2.50 / 2.30 - 1 = +8.7%. For a cleaner number, devig the closing line first with the other side's odds and compare against the fair price instead.
Why devig the closing line?
Raw closing odds include the bookmaker's margin, so they shorten the fair price and inflate your CLV. Devigging strips the margin using both sides of the market, leaving the fair closing line: measuring against that shows the edge the close actually implies.
What is a good CLV?
There is no magic number. What matters is a consistently positive average over a large sample, measured against the fair close. Many sharp bettors operate in the low single digits per bet; sustained double-digit CLV is rare outside promos and slow-moving books.
Is CLV more important than win rate?
Most serious bettors treat it as the better signal over short and medium samples. Win rate swings wildly with variance, while CLV grades the price of every bet against the market's final verdict, win or lose.
What does zero CLV mean?
Your price matched the closing line exactly, so that bet carried no edge against the market's final estimate. Bets placed right before the start tend to sit near zero because there is no time left for the line to move.
Can I be profitable with negative CLV?
In the short run, yes, variance allows almost anything. In the long run it is very unlikely: negative CLV means consistently taking worse prices than the market's final ones, and results tend to converge on that math over a large sample.
How do I track CLV across all my bets?
Checking bets one at a time does not scale. Bet Hero's bet tracker stores the closing line for every logged bet and computes your CLV automatically, so you can watch your average by sport, market, and bookmaker.
CLV is captured when you bet, not after
You cannot fix CLV once the market closes; the only way to generate it is taking prices above the fair line before the book corrects them. That is the same math this calculator runs, applied before the bet instead of after. Bet Hero compares bookmaker odds against devigged sharp lines in real time across more than 400 books, so you see the bets likely to beat the close while they are still available.