CLV (closing line value) measures how much the odds you took beat the fair odds of the same outcome at kickoff, once the market has priced in everything that is known. The formula, in decimal odds: odds taken ÷ fair closing odds − 1. If you take +120 (2.20) and the fair odds close at +105 (2.05), your CLV is +7.3%. It is the number that counts because it tells you whether you beat the market long before your results do.

What is the closing line?

It is the last price of an outcome before the game starts. In the hours before kickoff the worldwide betting market absorbs everything that is known: lineups, injuries, weather, the money of the people who bet the most and the best. That is why the fair closing odds, the market's consensus price with no sportsbook margin, are the most accurate estimate available of that outcome's probability.

If you got a higher price than that estimate, you bought the outcome at a discount. If you got a lower one, you overpaid, even if the bet went on to win.

How do you calculate CLV, step by step?

1. Write down the odds taken and the time of the bet.
2. Read the fair closing odds of the same outcome a few minutes before kickoff. MarketOdds shows the fair odds of every selection until the game starts.
3. Calculate the CLV: odds taken ÷ fair closing odds − 1, both in decimal. Example: 2.20 ÷ 2.05 − 1 = +7.3%.
4. Average it over every bet, winners and losers. A single bet tells you nothing; the average of a few hundred does.

Why does CLV count for more than results?

Because the result of a single bet is mostly noise: a 50% outcome wins or loses for reasons you do not control. To see an edge in results alone you need thousands of bets (Betting variance: why does a +EV bet still lose? shows how many). CLV, on the other hand, is measured on every bet, won or lost, and settles down much sooner.

A positive average CLV over hundreds of bets is the most reliable sign that you are getting better prices than the market. A negative one means you are overpaying, even in months when the results look good.

What does NinjaBet's data say about the CLV of value bets?

Since October 2026 NinjaBet has stored, for a sample of the value bets shown by the ValueBet finder and for every value bet saved to the Bet Tracker, the fair odds at the time of the bet and the fair closing odds. These are the first ten days, October 6-16, 2026 (all NinjaBet sites):

Figure (October 6-16, 2026)	Value
Value bets in the sample	119,777
Average expected value at the time of the bet	+2.58%
Average CLV against the fair closing odds (88,275 with a close)	+2.40%
Cases where the fair odds lengthened before kickoff	49.4%
Value bets saved by members and already settled	490
Won, against what the fair odds implied	43.3% (expected 46.8%)
Return on turnover of those 490	−6.84%

The two halves of the table tell the same story. The edge estimated at the time of the bet (+2.58%) held almost intact until kickoff (+2.40% CLV): the fair odds the tool uses are a real price, not noise. And yet the 490 bets that settled in those ten days lost 6.84%, because they won less often than expected. That is the variance of a small sample, and it is exactly why you watch CLV and not one week's balance.

How much CLV do you need to win in the long run?

A positive average CLV, measured over a few hundred bets, is the condition. The expected result sits close to the CLV: with +2-3% CLV you can expect a return of a few percentage points on turnover in the long run, with losing months along the way. The members' full record, losses included, is on the ValueBet results page.

How do you track your CLV with NinjaBet?

• Save value bets from ValueBet to the Bet Tracker: the tracker stores the fair odds and the expected value of every bet saved from the tool.
• The ValueBet Analysis page in Tracker Pro compares your actual profit with your expected profit and your win rate with the fair odds' one; the ValueBet Analysis guide explains how to read it.
• For a bet placed elsewhere, compare your price with the fair odds in MarketOdds shortly before kickoff.

Want to see it in practice? +EV picks shows members' verified picks and their public record, Check a pick prices any tip you are given, and the Telegram channels get them first.

Frequently asked questions

Does a positive CLV mean a profit?

Not by itself. It shows you got better prices than the market, which means a positive expected return. Over a small number of bets the actual result can still be negative, as the 490 bets in the table show.

How many bets do you need to judge your CLV?

A few hundred. CLV swings far less than results, so it settles much sooner: with 200-300 bets you already have a useful reading.

Why is the closing line the most accurate price?

Because it comes last: it contains all the information and all the money that reached the market before the game started.

Does CLV matter for surebets?

It does not need to: a surebet locks its margin the moment every leg is placed, wherever the line closes. Its risks are different, and they are in Why can a surebet lose?

Does a high CLV get you limited?

It can: it is one of the signals sportsbooks use to profile a customer. The Profiling and account limitations guide explains how to manage it.

Sources

• NinjaBet, ValueBet calibration samples (fair odds at the time of the bet and at the close), October 6-16, 2026.
• NinjaBet, ValueBet results, figures as of October 16, 2026.
• NinjaBet help center: Do value bets work? Fair odds and EV.

You must be 21 or older (18 in a few states) to bet in the United States, and bet only with operators licensed in your state. Gambling can be addictive: if you or someone you know has a gambling problem, call or text 1-800-GAMBLER, or the National Problem Gambling Helpline at 1-800-MY-RESET (ncpgambling.org), free and confidential, 24/7. Results vary and require time and capital; this article is information, not financial or legal advice. Last updated: October 16, 2026.