Closing line value: the measure that separates edge from luck

What closing line value is

Closing odds are the market's last price before kick-off. They rest on the most information and the most money. That makes them the best measure of what an outcome was really worth. Closing line value, abbreviated to CLV, is the difference between the odds you got and the fair closing odds.

If you got 2.20 and the closing odds were 2.00 with the margin removed, you got a better price than the market. If the bet lost anyway, it was a good bet that lost. If you got 2.00 and it closed at 2.20, it was a bad bet that may have won.

That is why professionals measure CLV and not win rate. Win rate is determined by the level of the odds and by chance. CLV is determined by whether you saw the price before the market.

The formula, with the margin removed

Convert the closing odds on all outcomes to probabilities: one divided by the odds. Add them up. The sum is over one hundred per cent, and the excess is the margin. Divide each probability by the sum to get the fair probabilities. The fair closing odds are one divided by the fair probability.

An example. Closing odds of 2.10, 3.40 and 3.60 give the probabilities 47.6, 29.4 and 27.8 per cent, which add up to 104.8. The fair probability of a home win is 47.6 divided by 104.8, so 45.4 per cent. The fair closing odds are 2.20. If you got 2.35 on the home win, your CLV is 2.35 divided by 2.20 minus one, so 6.8 per cent.

Always calculate with the margin removed. If you compare with the closing odds as they are, you seem to beat the market more often than you do. That is because the bookmaker's margin sits in the price. The margin calculator does the conversion for you.

How many bets you need

CLV converges much faster than the result, because the spread per bet is small. The CLV of a single bet usually lies between minus ten and plus ten per cent. The result per bet, by contrast, swings by the whole stake.

A worked example with an assumed spread of five percentage points per bet. After 25 bets the standard error of your average CLV is one percentage point. After 100 bets it is 0.5. After 400 bets it is 0.25. If your average CLV is plus two per cent after 100 bets, it lies four standard errors above zero. The result after 100 bets can still show a loss in 34 cases in 100 with a three per cent edge. The page on living off betting shows this.

That is why CLV is the first thing a professional looks at after a bad month. If CLV is positive, the method is right and the result is variance. If CLV is negative, the result is luck, and it is time to change something.

The pitfalls

The wrong reference. Closing odds tell you less at a bookmaker with a high margin and slow pricing. They tell you more at a bookmaker that sets the price for the market. Choose a reference that closes late and takes large bets. Stick to it, so that the numbers can be compared over time.

The line instead of the price. On Asian handicap and over/under markets the line moves before the odds do. Minus 0.75 at 1.90 that closes on minus 1 at 1.90 is a clearly positive CLV, even though the odds are unchanged. Convert to the same line before you compare, or measure only on markets with fixed outcomes.

The selection. Anyone who only counts CLV on the bets that won measures nothing. All bets belong in the journal, even those that were limited to half the stake. And a bet made because the odds were about to change only counts if you actually got it placed.

How to measure in Sweden without Pinnacle

Pinnacle's closing odds have long been the reference, and since October 2026 the bookmaker has not accepted Swedish customers. That does not change the measure, only where you get the number. Pinnacle's prices are still available outside Sweden and show up in odds comparisons. The fair price can be worked out from any market with the margin removed.

Our match pages save the closing odds after kick-off at sixteen Swedish-licensed bookmakers. Take the bookmaker that most often has the highest odds, remove the margin and use it as the reference. Smarkets gives a price close to the market's fair odds, with a commission instead of a margin.

Keep a journal with odds, stake, bookmaker, closing odds and result for every bet. My Bets in the tool saves your bets and results, and you get the closing odds from the match page. Calculate average CLV per month and per market, and you will see where the edge is and where it is missing.

What counts as good

Zero is the market. Anything above zero on average over hundreds of bets is an edge. Most people with an edge sit between one and four per cent. More than that over the long term usually means that you are miscalculating or measuring against the wrong reference.

CLV per market says more than the total. Many have positive CLV on main markets and negative on special bets, or the other way round. Place your stakes where the number is positive and stop where it is not. That is the whole method, and it needs no opinions about football.

Do you have a problem with gambling?

If you find it hard to control your gambling, or have had problems with gambling, you should not gamble at all. That also applies with a tool, because even a tool that calculates correctly can become a way into gambling that takes over.

Always seek help. Stödlinjen, the Swedish gambling helpline, answers on 020-81 91 00, free of charge and anonymously. Through Spelpaus you can exclude yourself from all gambling with companies licensed in Sweden. Gambling for money is only for those aged 18 or over.

Common questions about closing line value