See whether you beat the market's closing price. Enter the odds you took and the closing odds — we devig the closing line first and return your honest CLV, the strongest long-run signal for moneyline-type bets.
Closing line value (CLV) measures how the price you took on a bet compares to the market's price right before kickoff — the closing line. If you got 2.10 on a side that closed at 1.95, you beat the close; if it closed at 2.20, you didn't. It's the easiest number to check after every single bet, because — unlike the final score — the closing line only reflects information available up to kickoff (injuries, lineups, sharp money), not the randomness of what actually happened on the pitch, court or diamond.
Why it matters: the closing line is the sharpest, most information-dense price a market ever produces — every bettor, syndicate and pricing algorithm has had their say by kickoff. Beating the closing line consistently, across hundreds of bets, is the strongest evidence that you have a genuine, repeatable edge rather than a lucky run of results. It's also the only signal you get *immediately* — you don't need a full season of settled results to know whether a strategy is sound; you can check your CLV the moment the market closes.
One catch: the raw closing price still has the bookmaker's margin (the vig) baked into it, and comparing your price to a raw vigged close overstates your edge — especially when the vig sits unevenly across the two sides. The honest method is to devig the closing line first, which is exactly what the no-vig mode above does (see our No-vig calculator).
CLV compares the odds you took on a bet to the market's closing price — the price right before kickoff. If your price implies a lower probability than the closing price (i.e. you got better odds than the market ended up offering), you have positive CLV. It's measured per bet and averaged over a sample to judge a betting strategy.
The closing line is the most information-dense price a market ever produces — it has absorbed injury news, lineup confirmations and sharp money right up to kickoff. Consistently beating it across a large sample is the strongest available evidence of a genuine, repeatable edge, and unlike win/loss results it isn't distorted by the randomness of any single game.
Yes. The raw closing price still contains the bookmaker's margin (the vig), and comparing your price to it overstates your true edge — especially when the vig is split unevenly across the sides of the market. Devigging the full closing market first (our No-vig mode above) gives you the fair, no-vig closing probability to compare against, which is the honest way to measure CLV.
Only for moneyline-type markets — 1X2, match winner / h2h, moneyline — where CLV and long-run profit reliably track each other. For totals and handicaps, positive CLV can still coexist with a losing record, so on those markets your realized ROI and hit rate should lead, with CLV only as a secondary signal.