Closing Line Value (CLV) Explained | Measure Your Betting Edge

Closing Line Value (CLV)

CLV compares the odds you bet at to the final odds right before the game starts. If the odds get worse after you place your bet, you have positive CLV—meaning you got a better price than everyone else.

Simple Example: Basketball Bet

Let's say you bet on a basketball player to score over 25 points at odds of 2.50 (which means you'd win $2.50 for every $1 bet).

By game time, so many people bet on this player that the odds dropped to 2.20.

You have positive CLV because you locked in better odds (2.50) than what the market settled on (2.20).

This shows you spotted value before everyone else did. Getting positive CLV consistently means you're better at finding good bets than the average bettor.

Why CLV Matters

Research shows:

Bettors who consistently beat the closing line are profitable long-term.

CLV is the best predictor of betting success—better than win rate. Studies show bettors with consistent positive CLV have 2-3x higher returns than those who just track win rates.

Calculating CLV %

CLV % tells you how much better your odds were compared to the closing odds:

CLV % = Closing Implied Probability - Your Bet Implied Probability

Example

• You bet at odds of 2.20 (45.5% implied probability)
• Line closes at 2.00 (50% implied probability)
• Your CLV % = 50% - 45.5% = +4.5%

The market ended up thinking this outcome was 4.5% more likely than when you bet it. You got better odds before everyone else caught on.

What's a Good CLV %?

The key is consistency: if you get positive CLV on most of your bets over time, you're making smart bets even if some individual bets lose.

DMP Note

We track closing line value on every bet you log. Consistently beating the close = sustainable edge. Focus on getting good prices, not just picking winners.

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CLV is the scoreboard for sharp bettors. Focus on beating the closing line, and the profits will follow.

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How to Calculate CLV

There are three ways to calculate CLV, each with different precision levels. Use whichever method matches the data you have available.

Method 1: Simple Number Comparison

The quickest but least precise method. Just compare the line you bet to the closing line.

Example: You bet Over 24.5 points at -110 when the line opened. By game time, the closing line is Over 25.5. You got a full point better than the closing market — positive CLV.

Limitation: Doesn't account for juice differences. Getting Over 24.5 at -130 is very different from getting it at -110, even if the closing line is the same.

Method 2: Implied Probability Comparison

More precise. Convert both your bet price and the closing price to implied probabilities, then compare.

Step-by-step:

1. Convert your betting odds to implied probability
2. Convert the closing odds (for the same side) to implied probability
3. CLV = Closing Implied Probability - Your Implied Probability

Example:

• You bet Over 24.5 at -110 → Implied probability: 52.38%
• Closing line: Over 24.5 at -125 → Implied probability: 55.56%
• CLV = 55.56% - 52.38% = +3.18%

The market moved 3.18 percentage points in your direction after you bet. The closing market says your bet had a 55.56% chance of winning, but you only paid 52.38% implied probability for it. That's genuine edge captured.

Limitation: Still includes vig in both numbers. The vig inflates both probabilities.

Method 3: No-Vig (Devigged) Comparison

The most precise method. Devigs both the line you bet and the closing line before comparing.

Step-by-step:

1. Devig your bet's market (both sides) to get fair implied probability
2. Devig the closing market (both sides) to get closing fair probability
3. CLV = Closing Fair Probability - Your Fair Probability at time of bet

Example:

• You bet Over 24.5 when the market was -110/+100
  • Devigged: Over fair probability = 50.5%
• Closing market: Over 24.5 at -125/+105
  • Devigged: Over fair probability = 54.3%
• CLV = 54.3% - 50.5% = +3.8%

Why this is best: By removing vig from both measurements, you're comparing pure probability assessments. This is the truest measure of whether you captured edge.

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CLV Benchmarks

Not all positive CLV is created equal. Here's a benchmark table for interpreting your CLV numbers:

Key insights:

• +1% to +3% is the realistic target for most sharp prop bettors. Don't expect +5% CLV consistently — that level of edge triggers sportsbook limiters fast.
• Consistent CLV matters more than size. A bettor averaging +1.5% CLV over 500 bets is far more likely to be skilled than one with +5% CLV over 30 bets (which could easily be variance).
• Negative CLV doesn't mean every bet lost. You can win 55% of your bets and still have negative CLV if you're consistently betting into closing line movement. CLV measures process quality, not outcome quality.
• Sample size: You need at least 200-300 tracked bets with CLV data before drawing meaningful conclusions. Below that, variance dominates the signal.

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Five Causes of Negative CLV

1. Betting too late. Lines are most inefficient when they first post. By the time lines have been available for 12+ hours, sharp money has corrected most mispricings. If you consistently bet within the last few hours before game time, you're buying at the most efficient (hardest to beat) prices.

2. Betting at the wrong books. Recreational sportsbooks adjust their lines after sharp books move. If you bet at a recreational book that hasn't yet moved to match the sharp market, you might feel like you're getting a good price — but the sharp market has already identified that side as overpriced. The recreational book just hasn't caught up yet. However, in some cases the recreational book's slow adjustment creates genuine value when the sharp move was an overreaction.

3. Following public consensus. If your picks consistently align with the public side, you're betting into the direction the line is moving. The line moves from public money, and the closing line reflects that movement — meaning you paid early for what ended up being the popular (and often less valuable) side.

4. Ignoring line movement signals. When you bet a side and the line moves against you (toward the other side), it often means sharps disagree with your position. Repeatedly ignoring these signals leads to consistent negative CLV.

5. Inconsistent process. Some bets are well-researched and others are impulse plays. The impulse plays drag down overall CLV because they're essentially random — and random bets at standard vig have negative expected CLV.

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Five Strategies to Improve CLV

1. Bet early. Get your bets placed when lines first post, before sharp money has corrected mispricings. Early lines have the most inefficiency and therefore the most opportunity for positive CLV.

2. Use sharp book prices as your reference. Know what the sharp market says the fair price is. If your chosen book is significantly off from the sharp market, there may be value. DMP's consensus devigged probability serves this function.

3. Track and review your CLV weekly. Build a habit of recording your bet price and the closing price for every bet. Weekly CLV review reveals patterns — which bet types, which books, and which timing produce your best CLV.

4. Separate research-based bets from impulse bets. Track CLV for each category separately. If your researched bets show positive CLV and your impulse bets show negative CLV, the prescription is obvious: stop making impulse bets.

5. Line shop aggressively. Every nickel of better price you capture is positive CLV by definition. If you would have bet at -115 but found -108, you've improved your CLV on that bet by approximately 3 percentage points.