What is closing line value?
The closing line is the last price before the event starts. By then the market has absorbed all the news, the line-ups and the professional money, so the closing price of the sharpest market is the best available estimate of the true probability. Closing line value is how much better your price was.
CLV = odds taken ÷ fair closing odds − 1
Why CLV matters more than results
Results are noisy. A bettor with a real 3% edge can lose for months; a bettor with no edge can win for weeks. CLV removes most of that noise: if you keep beating the fair close, the market is confirming that your prices were good, bet after bet. That's why professional bettors treat CLV as the best early indicator of long-run results.
How to calculate it properly
The common mistake is to compare with the raw closing price, which still contains the margin. Remove the margin first. Example: you took 2.20. At kick-off the sharp market was 2.00 on your side and 1.87 on the other:
- Raw comparison: 2.20 ÷ 2.00 − 1 = +10% (flattering)
- Fair close with the power method: about 2.07
- Real CLV: 2.20 ÷ 2.07 − 1 = +6.1%
Do it for any bet in seconds with the free CLV calculator.
What good CLV looks like
- Below 0%: on average you take worse prices than the market's final view. Something needs to change.
- 0% to +2%: a small edge; margins and limits will matter.
- +2% to +5%: a solid edge, typical of disciplined value betting.
- Above +5%: excellent, and usually only sustainable on smaller markets or with very fast execution.
How BetTheDrop uses CLV
Every alert we send is followed until kick-off and compared with the fair closing price. We publish the results of the last 30 days, all of them, and your tracker stores the EV of every bet you place:
Expected value against the fair closing price, not actual winnings: you can lose money even on +EV bets. How we measure it.
How to improve your CLV
- Bet earlier: prices move towards the truth as kick-off approaches.
- Use alerts so you act within seconds of a sharp move, not minutes.
- Stick to markets where the sharp line has real limits behind it.
- Stop betting prices that have already moved: if the value is gone, skip it.
Example: a month of bets
Say you placed 120 bets in a month with an average CLV of +3.1% and finished 4 units down. Should you change anything? Probably not. Your prices beat the market's final view by a healthy margin; over 120 bets at average odds around 2.00, a swing of ±11 units is normal. Now imagine the opposite: 15 units up with an average CLV of −2%. That's luck, and it tends to run out.
When the closing price is less reliable
- Small markets (lower leagues, halves, sets, player props) close with less money behind them, so their closing price is a noisier estimate.
- Lines that moved (you took −3.5 and it closed at −4) can't be compared directly: compare the same line, or treat it as a rough guide.
- Late news after kick-off isn't in the closing price. CLV still works across many bets.
Common CLV mistakes
- Comparing with your own bookmaker's closing price instead of the sharp market's.
- Forgetting to remove the margin, which inflates CLV by a few points.
- Judging CLV on ten bets. Look at the average over a hundred or more.
- Ignoring stakes: a few big bets with poor CLV can matter more than many small good ones.