General Betting Math
Closing Line Value Calculator
This calculator answers what closing-line probability edge follows from the displayed assumptions. It does not pull prices, lineups, or results from a live feed.
Set up the closing line value calculation
Start with the exact event and grading period, then replace every default that does not belong to that case.
Use case and boundary
Measure how the price taken compares with the market closing price. The form fixes one betting calculation; closing-line probability edge belongs only to that selection and grading period; keep the compared line fixed while making that check.
Use the price offered for the exact selection rather than an earlier screenshot or a price from another sportsbook. Before using closing-line probability edge, account for this market-specific issue: the modeled probability, settled result, and sportsbook price must use the same market definition.
Formula and assumptions
The displayed rule is CLV compares the break-even probability of the bet price with the closing price.
For the Closing Line Value Calculator, the page applies CLV compares the break-even probability of the bet price with the closing price; every numeric term comes from a displayed field.
Reference stake is not a hidden correction in the Closing Line Value Calculator; its stated role is: stake used to express the price difference.
Match each field to its printed unit; a decimal fraction entered where a percentage is expected can overwhelm the intended adjustment; retain the original result for comparison.
When cash-out fair value is part of the decision, use the Cash-Out Fair Value; its inputs answer a different question from closing-line probability edge.
Choosing values that belong together
In the Closing Line Value Calculator, Odds taken sets the baseline: enter positive or negative American odds; keep its source with the result.
Closing odds modifies this closing-line probability edge case; enter positive or negative American odds; label it as observed, quoted, or projected.
For closing-line probability edge, enter Reference stake on the printed basis because stake used to express the price difference; retain the original precision.
A price move changes the economics even when the event assumptions stay the same; preserve the earlier Closing Line Value Calculator result before revising affected inputs.
Closing-line probability edge in a worked case
For the Closing Line Value Calculator, use the worked case as a reproducibility check before entering live market assumptions; none of its values should be copied automatically.
Applying the Closing Line Value rule: CLV compares the break-even probability of the bet price with the closing price.
Bet break-even rate is 54.13%; closing break-even rate is 52.15%.
For this closing-line probability edge example, when the worked result differs, verify the field values one by one rather than changing several assumptions together.
Where this simplified method can fail
- Closing line value is a price-quality measure, not proof that one bet was correct.
- Confirm the posted price, promotion restrictions, maximum stake, push treatment, and void policy.
- One source of disagreement outside the arithmetic is that the modeled probability, settled result, and sportsbook price must use the same market definition.
Common questions about closing-line probability edge
Can sportsbook rules override this calculation?
Yes. The Closing Line Value Calculator does not control how the sportsbook grades an event.
What is the purpose of the worked Closing Line Value Calculator case?
It provides a reproducible check of CLV compares the break-even probability of the bet price with the closing price.
Do extra decimals make closing-line probability edge more reliable?
No. More decimals cannot repair uncertain or stale assumptions.