CLV Explained
What it is
Closing line value (CLV) is the difference between the price you got and the price at game start. If you bet Lakers -3 -110 and the line closes -4 -110, you have +1 point of CLV. CLV is the single best leading indicator of long-run profitability in sports betting. Better than W/L, better than ROI in small samples, better than gut feel.
When to use it
- Always. Every bet you log should have CLV computed.
- When evaluating whether you actually beat the market this week, month, or quarter.
- When comparing yourself to the public.
How to read it
Why CLV matters more than W/L
Sports betting has enormous variance. Over 100 bets at +5% EV, you can lose money. Over 1,000 bets, the EV starts to show. But you might not have 1,000 bets in a quarter. CLV lets you check if you are sharp per bet, not just over thousands.
If your average CLV is +2% across 50 bets, the math is unambiguous: you are betting prices that the market eventually moves past. That is the definition of a winning bettor. Even if W/L is flat from variance, the long-run is positive.
How CLV is computed
| Step | Formula |
|---|---|
| Bet price | The American odds when you placed. |
| Close price | The American odds at game start (across the same book or sharp anchor, your choice). |
| Bet implied | Convert bet price to implied prob. |
| Close implied | Convert close price to implied prob. |
| CLV (prob) | close_implied - bet_implied (positive = you beat the close). |
| CLV (%) | (close_implied - bet_implied) / bet_implied * 100. |
Two anchors for the close
- Same-book close: compare your price to the same book's closing line. Tells you whether you beat that book.
- Sharp-anchor close: compare your price to Pinnacle's closing line. Tells you whether you beat the market. This is the stricter, more honest measure.
We default to sharp-anchor CLV in Tracker. Same-book is available as an optional view.
Worked example
Bet: Patriots +6.5 -105 (Friday)
Close: Patriots +4.5 -110 (Sunday morning, Pinnacle)
Bet implied: 51.2%
Close implied: 52.4% (sharp anchor)
CLV (prob): +1.2 percentage points
CLV (%): +2.3%
Game result: Patriots won outright (covered easily).
W/L: Won the bet
Verdict: Profitable both ways. The CLV was already telling you
the market agreed with you before kickoff.
Now imagine the inverse: same bet, Patriots covered, but the close was +8 -110. Same W (you won the bet), but your CLV is -1.5 pts. You got lucky. Repeat that pattern and the variance will catch up.
Common mistakes
- Skipping CLV because you won. Winning bets with negative CLV are loud variance. Track them anyway.
- Comparing your price to a soft book's close. Soft books move late and inefficiently. Anchor to Pinnacle's close.
- Confusing point CLV with EV%. 1 point of CLV is not 1% EV. The relationship depends on the price level.
- Treating CLV as profit. CLV is a leading indicator. The bet still has to grade. Long run, +CLV = +profit.
- Cherry-picking which bets to count. Every bet counts. Bad CLV on bets you wish you hadn't made is information.