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Closing line value calculator & tracker

Beating the closing line is the clearest sign you're betting with an edge. Check any bet in seconds, then track your CLV over time — free, with no sign-up.

Closing line value calculator

Compare the price you bet with the price at kickoff.

Optional. Adds the no-vig fair price, the most accurate CLV measure.

Closing line value

+7.56%

You beat the closing line.

Implied prob. move

+3.6 pts

47.6% → 51.2%

EV vs. fair close

+2.72%

Fair chance 48.9%

CLV tracker

Log bets to see how often you beat the close. Saved in this browser only.

Bets

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Beat the close

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Average CLV

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What is closing line value?

Odds move between when a line opens and when the game starts as information arrives and money comes in. The final price — the closing line — is the market's best estimate of the true probability.

Closing line value compares your price with that final estimate. If you consistently get better odds than the close, you are consistently betting at prices the market later decides were too generous. That is what a real edge looks like.

How CLV is calculated

CLV = (decimal odds taken ÷ decimal closing odds) − 1
Price-based CLV. Positive means your odds were better than the close.
EV vs. close = decimal odds taken × fair closing probability − 1
No-vig CLV. Uses both sides of the closing market to remove the bookmaker's margin first.

Example: you bet +110 (2.10). The line closes -105 (1.95) on your side and -115 on the other. Price-based CLV is 2.10 ÷ 1.952 − 1 = +7.6%. Removing the vig, your side's fair closing probability is 48.9%, so the bet was worth 2.10 × 0.489 − 1 = +2.7% in expected value — the more conservative and more accurate figure.

How to use CLV

  • Record the closing price for every bet. It takes seconds right before kickoff and turns a noisy win-loss record into a clear signal.
  • Judge yourself over hundreds of bets. One bet's CLV means little; your average and your beat rate over a season mean a lot.
  • Bet early when you have an edge. Lines tend to move toward the sharp side, so the best prices are often available before the market settles.
  • Combine it with EV. The +EV calculator prices a bet before you place it; CLV checks your judgement afterwards.

Frequently asked questions

What is closing line value (CLV)?

CLV measures how the odds you bet compare with the final odds just before the event starts. If you bet a team at +110 and it closes at -105, you beat the closing line — you got a better price than the market's final verdict.

Why does CLV matter more than wins and losses?

The closing line is the most accurate price a market produces, because it reflects all the information and money that came in. Beating it consistently is strong evidence of a real edge, and it shows up in a few hundred bets — far sooner than profit does.

What is a good CLV?

Any consistently positive average is good. Beating the close on more than half your bets with an average CLV of even +1–2% points to a profitable long-term approach.

Can I have positive CLV and still lose money?

Yes, over short periods. CLV measures the quality of your prices, not the results of the games. Over a large sample, bettors with positive CLV tend to profit.

Where do I find closing odds?

Check the line at your sportsbook right before the start, or use an odds-comparison site's line history. For the most accurate CLV, use a sharp book's closing price and enter both sides to remove the vig.

Is my tracker data saved?

The CLV tracker on this page saves to your browser only — nothing is sent to SlipBets. Clearing your browser data removes it, so export a CSV if you want a copy.

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