Closing Line Value (CLV) Calculator: Beat the Close (2026)
Closing line value is the single best proof that your bets have an edge. Enter the price you took and the closing price to grade one bet, add the other side to strip out the vig for a true EV, or paste a whole batch and see if you are genuinely beating the close. Free, private, and it runs entirely in your browser.
Everything runs in your browser. Nothing is uploaded, no account is needed, and your batch of bets is saved on this device only.
CLV calculator
Grade one bet
Your closing line value
Closing line value: the one number that proves you have an edge
Winning bettors do not judge themselves by last night's result, because a single bet tells you almost nothing. As of 2026 the sharp standard is closing line value, or CLV: did you consistently get a better price than the market settled on? This free ToolsGambling calculator grades it honestly, removes the vig for a true edge, and does it in your browser with no account.
Why use the ToolsGambling CLV calculator
Most CLV calculators do one thing: divide your odds by the closing odds and show a percentage. That number is inflated, because the closing price still has the bookmaker's margin baked in. This tool goes further. It removes the vig, grades a whole batch of bets at once, and tells you honestly whether your sample is big enough to trust.
It removes the vig for a true edge
Add the opposing side's closing price and the calculator devigs the market to a fair probability, then measures your bet against that. Raw CLV overstates your edge by the margin; the vig-free EV is the number sharp bettors actually use.
It grades a whole batch, not one bet
Paste a season of bets and get your average CLV, your beat-the-close rate and a distribution at a glance. One bet is noise. The pattern across hundreds is where the truth lives.
It is honest about sample size
Below thirty bets the verdict stays "too few", on purpose. A handful of good closing lines is luck, and a tool that calls you sharp after five bets is lying to you. This one waits for real evidence.
Any format, no account, private
Decimal, American or fractional, it reads them all. Nothing is uploaded, there is no signup wall, and your batch stays on your device. Single results get a shareable link if you want to compare with a friend.
What is closing line value?
Closing line value is the difference between the odds you got and the final odds when the market closed. If you backed a team at 2.10 and it closed at 1.95, you have positive CLV: you locked in a bigger price than the market's final, sharpest opinion.
It matters because the closing line is the most accurate price a market produces, once all the money and information are in. Beating it consistently is the clearest sign that you are finding value before the market does, which is exactly what a long-term winner has to do.
The closing line value formula
The raw CLV of a single bet compares the two decimal prices:
CLV % = (your odds / closing odds − 1) × 100That raw figure includes the bookmaker's margin, so it flatters you slightly. The honest version removes the vig first: devig the two closing prices to a fair probability, then measure your bet's expected value against that fair line. This calculator does both, and shows the vig-free EV whenever you supply the opposing price.
For a long time I judged my betting by my balance, which lied to me during good variance. The month I started logging CLV instead, I found I was beating the close by about 1.5% on soccer and losing to it on props. The balance had hidden both. CLV showed me where the edge actually was.
How to calculate closing line value
Three steps, and the tool does the maths, including the vig removal, for you.
- 01
Record the price you took
Note the odds when you bet, in whatever format your book shows. Do it as you bet, before the number fades from memory.
- 02
Grab the closing price
When the market closes, note the final odds for your side. For the honest version, note the other side too so the vig can be removed.
- 03
Read it, then track it
One bet is a data point. Paste a batch to see your average CLV and whether, over a real sample, you are genuinely ahead of the close.
What is a good CLV percentage?
There is no single magic number, but over a large sample these ranges are how sharp bettors read closing line value.
| Average CLV | What it means |
|---|---|
| +2% and up | Elite. Sustained CLV this high over hundreds of bets is genuine sharp territory. |
| +0.5% to +2% | Good. A real, repeatable edge that most winning bettors live on long term. |
| 0% to +0.5% | Marginal. You are roughly matching the close after the vig; keep the sample growing. |
| Below 0% | Negative. You are getting worse prices than the market's close, a long-term losing pattern. |
CLV terms
- The final odds a market offers just before it closes, its most accurate price.
- How much better a price you took than the closing line, in percent.
- The bookmaker's built-in cut, which makes raw prices imply more than 100% probability.
- Removing the margin from a two-way market to recover the fair, true probabilities.
- Getting a bigger price than the closing line, the event that produces positive CLV.
- Your average profit per bet against a fair price, the vig-free version of CLV.
Closing line
Closing line value (CLV)
Vig / margin
Devig
Beat the close
Expected value (EV)
More free betting tools on ToolsGambling.com
CLV pairs naturally with the tools that price, track and value your bets. These free calculators help.
Bet responsibly
Chasing closing line value is still betting, and the house edge is real. Only stake what you can afford to lose and take a break if it stops being fun. Free, confidential help is at BeGambleAware.org.
Evgeniy Volkov
Verified ExpertFullstack developer with a background in mathematics. I build the calculators and game-style tools on ToolsGambling with Pixi.js and modern web tech, and every result uses transparent probability formulas you can verify yourself.
CLV calculator FAQ
Related betting tools
Odds movement tracker
Watch a price move from open to close, so you can capture the value before the line settles.
Value bet finder
Scan live odds for prices that beat the vig-free fair line, before the market corrects them.
Bet tracker
Log every bet with odds and result, the history you grade for CLV over time.
Tipster Leaderboard
Rank tipsters by proven edge, not raw ROI. See who has actually beaten the closing line.
Edge analyzer
Turn your closing-line results into an estimate of your real long-term edge.
Odds converter
Switch any price between decimal, fractional and American, with implied probability.