Free calculator
Closing line value calculator
Enter the odds you bet and the closing odds for both sides of the market. The calculator removes the margin from the close and shows how much value your price had against it.
You beat the closing line. Your price was 5.0% better than the fair closing price.
Runs entirely in your browser; nothing you type is sent anywhere. For information only: PinnRadar sells odds data, takes no bets and gives no betting advice.
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Get a free key →How CLV is calculated
First the closing market is de-vigged: the implied probabilities of every outcome are scaled so they add up to 100%, which gives the fair closing price of your side. Then:
- CLV = your odds / fair closing odds − 1
- Expected value = fair closing probability × your odds − 1
- Probability edge = fair closing probability − 1 / your odds
Example: you bet 2.10. The market closes at 1.95 / 1.95. The fair close is 2.00 on each side, so your CLV is 2.10 / 2.00 − 1 = 5%, and the expected value of the bet, if the closing price is right, is also 5%.
Why the closing line matters
Prices move as information and money reach the market, and the close is where that process ends. A bettor who keeps getting better prices than the close is, on average, getting the information in first. That is also why sharp markets watch dropping odds: a falling Pinnacle price is the line moving toward the close in real time.
Tracking CLV at scale
Measuring CLV by hand works for a few bets. For a full record you need the closing price of every market you bet. The PinnRadar odds APIdelivers Pinnacle’s prematch and live prices over REST, WebSocket and SSE, so a small script can save the last price before kick-off and compute CLV for each bet. To strip the margin from any price, use the no-vig calculator.
Questions people ask
What is closing line value?
Closing line value (CLV) compares the price you bet with the price the market closed at. If you took 2.10 and the fair closing price was 2.00, you have 5% CLV. The closing line is the market's final, most informed estimate, so consistently beating it is the best short-term sign that a bettor has an edge.
Why measure CLV against no-vig odds?
The raw closing price still contains the bookmaker's margin, which flatters every bet by a couple of percent. Removing the margin first, using the other side of the market, measures your bet against the fair price instead.
Which closing line should I use?
Most bettors use Pinnacle's closing line because it is a sharp, low-margin market that moves on informed money. Its no-vig close is the common benchmark in betting research and among professional bettors.
Is CLV the same as profit?
No. Single results are noisy; CLV tracks the quality of the price you got. Over many bets, a positive average CLV tends to go with long-run profit, which is why it is used to evaluate a strategy long before results are significant.
How can I record closing lines automatically?
Store the Pinnacle price for each market just before the start. The PinnRadar API serves prematch and live Pinnacle prices over REST and streams every change, so you can log the close for every bet you place.
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Feed these numbers from code
Live and prematch Pinnacle prices over REST, WebSocket and SSE, with no-vig prices and drop alerts built in. Compare the plans, or start on a free key.