Closing line value tells you whether you got a better price than the market settled on just before kick-off. If you took 2.20 and the odds closed at 2.00, you beat the close. Over many bets, that is one of the clearest signs that you are judging prices well.
This guide shows you how to measure closing line value, why it gives you a faster read than profit, and where it falls short.
Read the transcript
How do you know if your prices are good? Check them against the closing line.
The closing line is the last price before kick-off. It's usually the market's best guess, because it includes all the news and money.
Say you took two point two, and the price closed at two.
Divide the price you took by the closing price, and take away one. You beat the close by ten per cent.
Do that consistently, and it's a strong sign your prices are good, even before your profit shows it. For a fairer test, remove the margin from the closing price first. One bet tells you very little. Hundreds tell you a lot.
Please bet responsibly.
The short version
- Closing line value (CLV) compares the odds you took with the final odds before the event starts.
- The simple sum is odds taken ÷ closing odds − 1. So 2.20 against a 2.00 close is +10%.
- A fairer test strips the bookmaker margin out of the closing price first.
- CLV settles faster than profit, but it is still an estimate. It does not promise a profit, and most bettors lose over time.
What is closing line value?
The closing line is the last price on offer before a market shuts, which for football usually means kick-off. By then, the market has taken in team news, injuries and a lot of money from informed bettors. So the closing price tends to be the best public estimate of the true chance.
Closing line value is the gap between your price and that final price. If you keep getting bigger odds than the close, you are often spotting value before the market does. If you keep getting smaller odds, the market is telling you that your prices were too short.
This links straight back to implied probability. Odds of 2.00 imply a 50% chance, while 2.20 implies about 45.5%. Therefore, if the close at 2.00 is closer to the truth, you got paid as if the chance were lower than it really was.
How to measure closing line value
There are two common ways to work it out. First, there is the raw method, which uses the closing odds exactly as shown. Next, there is the no-margin method, which removes the bookmaker margin before you compare.
The raw method
The formula is short: CLV % = odds taken ÷ closing odds − 1. It is quick, and it works well as a rough guide. However, the closing odds still include the bookmaker’s margin, so the raw figure can flatter or hide your real edge.
Worked example
You back a team at 2.20 (6/5) on Thursday. By kick-off, the same selection has shortened to 2.00 (evens).
- CLV = 2.20 ÷ 2.00 − 1 = 0.10
- That is +10% closing line value.
Put another way, your odds were 10% bigger than the price the market finished on.
The no-margin method
A closing price of 2.00 is not quite a fair 50%, because the book adds a margin. To fix this, you work out the fair odds for the close and compare against those instead.
Worked example
Say a two-way market closes at 2.00 and 1.90.
- Implied chances: 1 ÷ 2.00 = 50.0% and 1 ÷ 1.90 = 52.6%. The book adds up to 102.6%.
- Fair chance for your side: 50.0% ÷ 102.6% = 48.7%, so fair odds are about 2.05.
- CLV against the fair close: 2.20 ÷ 2.05 − 1 = about +7.2%.
So the raw figure said +10%, but the margin-free figure is closer to +7%. That smaller number is the better guess at your edge.
The no-margin method needs a sharp closing price to work well. In the UK, many bettors use Betfair Exchange prices as the benchmark, because a busy exchange market carries little built-in margin. Use the calculator below to compare your odds with the close.
Closing line value calculator
Why closing line value beats profit over a small sample
Profit is noisy. Even with a real edge, a run of 100 bets at odds of 2.00 can easily leave you behind, simply because of luck. In fact, you may need thousands of results before profit tells you much at all. Our guide to betting variance shows how wide those swings can be.
Closing line value cuts through some of that noise. Each bet gives you a reading the moment the market closes, whether the bet wins or loses. As a result, 200 bets with a steady positive CLV tell you more about your pricing than 200 bets of profit or loss.
That is why many careful bettors track CLV next to expected value in their betting records. It is a check on the process, not just the outcome.
The limits of closing line value
Closing line value is useful, but it is not proof. Keep these limits in mind:
- The close can be wrong. Markets are efficient on average, not every time. A single close can miss late news.
- Thin markets close badly. In low-interest leagues or niche markets, the final price may reflect little money. So it is a weak benchmark.
- Margin matters. Raw CLV against a high-margin close can look good even when your edge is small or zero.
- It is still a sample. 50 bets of positive CLV can be luck too, just less luck than profit.
- It does not cover your costs. Exchange commission, for example, comes out of any winnings. Check the current rate before you compare.
The idea that the closing price is a good estimate rests on the efficient-market hypothesis. That theory comes from finance, and it holds best where lots of informed money is at play.
Finally, a good closing line value record can lead to account limits. Bookmakers are legally allowed to restrict accounts for commercial reasons, and they often watch for customers who beat the close. Read more in our guide to betting account restrictions.
Using closing line value sensibly
Treat closing line value as a mirror for your pricing, not as a reason to bet more. Keep stakes small and fixed while you gather data. Then, after a few hundred bets, ask a simple question: did my prices tend to beat the fair close?
If the answer is no, that is useful too. It means you can stop, rethink your method, and avoid paying for the lesson with more losses. Most bettors who track CLV find they do not beat the close, and that honest result is worth knowing.
Related guides
18+ only. Betting should be fun, and every bet can lose. Set a budget you can afford to lose and stick to it. For free, confidential support, visit BeGambleAware.org or call the National Gambling Helpline on 0808 8020 133.