Closing Line Value Calculator
Measure whether you beat the closing number.
Enter odds at bet time and at close (decimal or American). Positive CLV means you took a better price than the final market.
Closing Line Value Calculator
Adjust inputs to see updated results.
Table of Contents
How to Use This Calculator
Enter decimal odds at bet time (open) and decimal odds at close for the same side. Positive CLV means you beat the closing number in implied-probability terms.
Same selection
Open and close must refer to the identical bet (team, market type, line).
Decimal odds
Both fields expect decimal prices > 1.00. Convert American with our converter if needed.
Read CLV %
The headline is CLV relative to the closing line—how much better your price was versus the final market.
Track over time
Single bets are noisy; CLV is most meaningful across hundreds of wagers.
What Is CLV?
Closing line value compares your bet’s implied probability to the closing line’s implied probability. Sharp bettors treat sustained positive CLV as evidence of skill or better information.
Formula
CLV ≈ (popen − pclose) / pclose where p = 1 / decimal
Examples
Example 1 — Default inputs
Open 2.05, close 1.95. Implied 48.78% vs 51.28%. CLV ≈ −4.9% (negative—you took a worse price than close). Numbers should match the live output.
Example 2 — Positive CLV
Open 2.20, close 2.00. You locked extra implied probability versus what the market settled on—positive CLV.
Example 3 — Line shopping
Compare CLV from two books’ closing feeds if you have them—some closers are sharper than others.
Frequently Asked Questions
No—it is an expectation signal over many bets. Variance still dominates short samples.
Implied probability is cleanly 1/d. American can be converted without ambiguity.
That often yields positive CLV versus close—your open was better than the final market price.
Yes, if you can define a consistent closing price. Props may have thinner liquidity.
ROI measures realized profit; CLV measures price quality versus the close. They complement each other.
