CLV Calculator
Did you beat the closing line? Enter the decimal odds you took and the closing odds for the same selection.
Your closing line value
+7.69%
You beat the close — you got a better price than the market’s final judgement.
Implied probability you paid
47.6%
Market's closing estimate
51.3%
Formula: (bet odds − closing odds) ÷ closing odds × 100 — identical to the CLV SmartBet Lab computes on synced bets.
Why CLV is the metric sharp bettors live by
The closing line is the market's final, most-informed estimate of an outcome's probability. Beating it consistently means you keep buying probability for less than its market value — which is the definition of an edge, and it shows up hundreds of bets before your profit graph does. The full explanation, including what counts as a good CLV and the honest caveats, is in our guide: What is closing line value?
One bet at a time, this calculator tells you a fact. Tracked across your whole betting history, CLV becomes a verdict — and that's the part that's miserable to do by hand.
SmartBet Lab captures real closing lines for every synced bet automatically — your average CLV, beat rate and per-league breakdown, computed from your actual history.
Frequently asked questions
What is a good CLV?
Consistently positive CLV of +1% to +3% over a large sample of bets is genuinely sharp — enough to beat the bookmaker margin. A single bet’s CLV means little; the signal lives in your average over 50+ graded bets.
Can I profit long-term with negative CLV?
Only in markets where the closing line itself is inefficient (small leagues, niche props). In liquid markets, persistent negative CLV means the market consistently disagreed with you and was right — results will eventually follow it down.
Where do I find closing odds?
Check the price of your exact selection just before the event starts. Doing this by hand for every bet is tedious, which is why SmartBet Lab captures closing lines automatically for every synced bet and grades your CLV per bet, per league, and over time.