What Is Closing Line Value (CLV)?
CLV measures whether the price you got was better than the line at kickoff. It's the single most reliable signal that you're betting well — win or lose.
What CLV is
The closing line is the final price a market settles on right before the event starts. Closing line value is the difference between the price you locked in and that closing number.
If you bet a team at +3.5 and it closes +2.5, you got a better number than everyone betting at the close. That's positive CLV.
You bet Underdog +3.5. By kickoff the market has moved to +2.5. Your +3.5 is now better than the closing price — even if the bet loses, you got value the market later agreed with.
Why it predicts profit
Sharp markets converge as money and information pour in, so the closing line is the most accurate single estimate of a game's true odds. Beating it consistently means you're finding value before the market does.
Win/loss is noisy — a skilled bettor can have losing weeks. CLV stabilizes much faster, which is why pros track it as their north star.
CLV % = (your decimal odds ÷ closing decimal odds) − 1
Bet +110 (2.10) that closes -105 (1.95): 2.10 / 1.95 − 1 ≈ +7.7% CLV.
Reading CLV honestly
CLV is a long-run signal, not a guarantee. Plenty of positive-CLV bets lose, and the occasional bad-CLV bet wins. Judge it over hundreds of bets, not a single game — averaging +1–2% CLV across a large sample is genuinely sharp.
Key takeaways
- CLV compares your price to the closing line — the market's sharpest estimate.
- Consistently beating the close is the best predictor of long-term profit.
- Not every positive-CLV bet wins; it's a signal measured over large samples.
- Averaging +1–2% CLV is sharp, professional-grade betting.
Common mistakes
- Judging CLV by whether a single bet won or lost.
- Dismissing CLV after a winning week — you can win with poor CLV and still be a long-term loser.
- Not logging the closing line, so you never actually know your CLV.
FAQ
How do I measure CLV?
Log each bet's price and the closing price, then compute (your decimal ÷ closing decimal) − 1. Parlae tracks this automatically for plays you save.
What counts as good CLV?
Consistently positive is the goal. Averaging +1–2% across hundreds of bets is sharp.
Does CLV apply to player props?
Yes, but prop closing lines are noisier than main markets, so you need a larger sample to trust the signal.
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