Closing Line Value (CLV) is a metric that compares the odds at which you place a bet with the closing odds, i.e. the last odds available before the event starts. If you bet at odds higher than the closing odds, you are ‘beating the line’ and, in the long run, this usually indicates that you are getting better prices than the market.
CLV does not predict whether a bet will win or lose, but it is one of the most reliable indicators for assessing whether you have an edge in your decisions.
In decimal odds, a straightforward way is to measure the percentage improvement over your price
CLV% = (Your odds – Closing odds) / Your odds × 100
• If you enter at @2.20 and the market closes at @2.00 → CLV% = (2.20 – 2.00) / 2.20 = +9.09% (better than the close).
• If you enter at @2.20 and it closes @2.40 → (2.20 – 2.40) / 2.20 = –9.09% (worse than the close).
You can also look at it as the difference between your odds and the closing odds or by comparing implied probabilities; the idea remains the same: if your number improves on the close, you are on the right track.
• It reflects whether you make decisions before the market adjusts.
• A positive CLV repeated across many bets usually correlates with profitability.
• It allows you to evaluate your method without relying on the short term or variance.
CLV is most evident in liquid, pre-match markets (major leagues, leading bookmakers), where the closing price accurately summarises public information. In less liquid or live markets, latency and adjustments make CLV more noisy.
Many bettors forget that odds are affected by the bookmaker’s margin (overround). This margin ensures that, no matter what happens, the operator wins.
Therefore, for a more accurate calculation of CLV, some adjust the odds to eliminate this margin and work with ‘real’ or ‘fair’ odds. This gives a clearer picture of whether you are really outperforming the market, beyond the effect of the commission.
• External influence: social media, tipsters and mass movements can move odds.
• Timing of the bet: entering early often helps to capture value odds.
• Markets with low liquidity: such as minor sports or secondary leagues, where small movements greatly alter the odds.
• Specialisation: knowing a sport or market well allows you to spot errors in the odds.
• Insider information: those who have early access to key data have an advantage.
1. Record each bet: entry odds, closing odds, market and result.
2. Calculate the CLV% per bet and the average after each block (e.g. every 100).
3. Segment by league, sport or bet type.
4. Adjust your strategy according to which markets you bet on most frequently.
5. Do not make decisions based on small samples. CLV is reliable in volume.
CLV is not a strategy, but a way to verify whether your strategy makes sense. If you work with value betting, you should see a positive CLV over time. This will confirm that you are finding odds above their real value before the market corrects them. To do this, betting apps such as Inbetia provide you with the perfect environment to move forward methodically, as they allow you to automate tasks and have a well-structured strategy.
You don’t need complex systems. A well-organised spreadsheet allows you to track:
• Note down: date, market, bookmaker, your odds, closing odds and result.
• Calculate: CLV% per bet.
• Evaluate: % of bets with positive CLV, average CLV per block.
CLV is one of the indicators most used by professional bettors to know if they are betting with an advantage. Although it does not replace other indicators such as ROI, its ability to isolate the ‘price’ factor makes it a powerful tool for those looking to bet wisely.
Inbetia does not calculate CLV, but it helps you to operate with value bets in an orderly manner, centralising your bets, rules and entry criteria. It is ideal for managing your strategy, automating part of the process and keeping track of your performance.
