Free betting tool
Free CLV Calculator: Calculate Closing Line Value for Sports Betting
Closing line value compares the price you took with the market price at close. It will not predict tonight’s result, but it can help you measure whether your process repeatedly captured better or worse prices.
For the price comparison below, open the CLV calculator and enter your own entry and closing odds.
What is a CLV calculator?
A closing line value calculator compares your entry odds with closing odds and translates both prices into implied probabilities. It gives you a consistent way to see whether your bet was priced more favorably than the closing market.
For a favorite, taking -105 before the market closes -120 is generally better pricing than waiting for the close. For an underdog, taking +130 before a close of +115 is generally better pricing. The calculation should use probabilities rather than treating the raw American-odds difference as a universal measure.
How to calculate CLV
- Record the odds you took when you placed the bet.
- Record the closing odds for the same market, selection, and ruleset.
- Convert each price to implied probability.
- Compare your implied probability with the closing implied probability.
For negative American odds, implied probability is |odds| ÷ (|odds| + 100). For positive American odds, it is 100 ÷ (odds + 100). A calculator prevents small conversion mistakes from becoming a recurring hobby.
CLV example
Suppose you bet -110. That price implies 52.38%. The market closes -125, which implies 55.56%. Your ticket required a lower win probability than the closing market required, so the comparison indicates positive CLV.
This does not mean the specific bet must win. It means the price you secured was better than the later closing price in this example. A result and a price-quality signal are different things, even if they occasionally agree politely.
Why no-vig fair price matters
Sportsbook odds usually include vig. If you have both sides of a two-outcome market, you can calculate a no-vig estimate by removing the combined overround and normalizing the probabilities. This does not create a perfect truth oracle, but it is often a cleaner reference point than comparing a single listed price in isolation.
Use the fair-price estimate alongside your entry and the close to understand whether the apparent movement reflects meaningful information, margin changes, or simply a different sportsbook pricing convention.
How to use CLV responsibly
- Compare matching markets and rules. A different alternate line is not a valid closing comparison.
- Track a substantial sample instead of interpreting one or two wagers as a verdict on your process.
- Review CLV alongside ROI, stake sizes, market type, and record quality.
- Do not use positive CLV as permission to ignore bankroll limits or bet more than you can afford to lose.
Calculate CLV free with evrai
Enter your odds and closing odds in evrai’s free CLV Calculator to see CLV percentage, implied probabilities, no-vig fair price, and expected-value context. Use it for one-off checks, then use a tracked record to evaluate your process over time.
Frequently asked questions
What is good CLV in sports betting?
There is no single universal threshold because market liquidity, bet type, data quality, and calculation method matter. Focus first on measuring consistently across a meaningful sample and comparing like with like.
Can I calculate CLV before a game starts?
You need a defined closing price to complete a CLV comparison, so the final calculation happens after the market closes. You can still record the entry price and your reasoning before the event begins.