Calculators
Closing Line Value Calculator
Find out how well you beat the market by using this closing line value calculator. It will uncover your true edge with optional vig-adjusted odds.
Closing Line Value Calculator
Measure whether you beat the closing line — the single best signal of long-term betting edge. Enter your bet odds and the closing odds to see your CLV. Add the opposite side's closing odds for a vig-adjusted true CLV.
What is Closing Line Value?
Closing Line Value (CLV) is simply the gap between the odds you bet at and the odds available on the market right before kickoff, known as the closing line. That closing price is about as sharp as it gets since it reflects all the information and money that has moved the price right up until kickoff.
If you consistently get better odds than the closing line, you have positive CLV. That means the market shortened in your favour after you placed your bet, a strong signal that you found value before the rest of the market caught up.
Example:
You back a team at 2.20, and by the time the game starts, the price has shortened to 2.00. You beat the closing line, so you have positive CLV on that bet.
Why does this matter so much? Because your win-loss record over a small sample doesn't tell you a whole lot on its own. You can lose a bet and still have made a genuinely smart, +EV call. That's where CLV earns its keep.
Tracking CLV over hundreds of bets strips out that noise. Sharp bettors treat consistent positive CLV as the clearest long-term signal that their process beats the market, even when individual results swing around.
How to Calculate Closing Line Value
CLV is calculated by comparing your bet odds to the closing odds.
CLV % = ((Your Odds ÷ Closing Odds) − 1) × 100
A positive percentage means you beat the closing line. A negative percentage means the market drifted the other way, and better odds were available after you already placed your bet.
This basic formula doesn't account for the bookmaker's margin baked into the closing price. For a more precise vig-adjusted CLV, you first strip the vig out of the closing line using the odds from all sides of the market, then compare your bet against the fair closing odds instead of the raw, biased ones. This is what the 'Vig Adjustment' field on this calculator does automatically.
How Does the CLV Calculator Work?
The calculator needs two figures to return a basic CLV:
your Bet Odds
Closing Odds for the same side.
Enter both, and it returns your CLV percentage instantly.
For a more accurate result, use the optional Other Side Closing Odds field under Vig Adjustment. This lets the calculator take out the vig from the closing line and compare your bet against the fair, no-vig closing price instead of the raw bookmaker price. It's the more reliable number, since it removes the bookmaker's margin from the result.
Example
Say you backed a team at 2.10. By kick-off, that side is priced at 1.90, with the opposite side sitting at 2.00.
Bet Odds: 2.10
Closing Odds: 1.90
Other Side Closing Odds: 2.00
The raw closing price of 1.90 makes it look like you beat the market by 10.53%. Some of that gap is just the bookmaker's margin. Once the vig is removed, your real edge over the fair closing price sits at 7.69%. Still positive, just more accurate.
If you want to check the fair, no-vig price of any market yourself, Betsniper's Fair Odds Calculator does exactly that, and it's a useful way to sense-check any vig-adjusted CLV figure by hand.
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