What Is Closing Line Value?
Closing line value (CLV) measures how your bet's price compares to the final ("closing") odds available right before a game starts. The closing line is widely treated as the market's most efficient price, since it has absorbed the most information — sharp money, injury news, weather, lineup changes — by kickoff. If you bet at a better price than the close, you captured value the market later agreed with; if the line moved against you, you gave value away.
The formula used here is the decimal odds ratio: CLV% = ((your decimal odds ÷ closing decimal odds) − 1) × 100. A positive CLV% means your odds were higher (better) than the closing odds — you beat the close. A negative CLV% means the closing odds were higher than what you took — the market moved away from your side after you bet, meaning your price was worse than the market's final assessment.
See the full CLV guide for the theory behind why CLV predicts long-run edge, and the line shopping guide for how to consistently get better prices in the first place.
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The Limits of CLV
CLV is a genuinely useful early signal, but it is not the whole story. It measures whether you got a good price, not whether the bet actually won. A bettor can post strong positive CLV across a whole season and still have a losing record if their underlying picks are wrong more often than the price gap suggests, and conversely a bettor can win money short-term while giving away CLV on every bet, purely from variance. Consistently positive CLV over a large sample is a strong signal that your process finds real market inefficiencies, but realized ROI is what actually pays your bankroll — track both, and don't treat CLV as a substitute for results over a large enough sample to matter.
How Olympus Bets Uses CLV
CLV tracking is part of how Olympus Bets validates that its model is finding real edges rather than noise:
- Line capture at bet time records the exact odds behind every recommendation the moment it's generated
- Closing line capture records the final odds right before the game starts
- CLV tracking compares the two across every graded pick, league-wide and per sub-niche
- Profitability zone analysis uses long-run CLV and realized results together — not CLV alone — to gate which bet types are eligible
- Track record reporting surfaces realized win rate and units alongside CLV, since actual outcomes are the metric that matters most
Further Reading
- Closing Line Value: Full Guide — why CLV predicts long-run edge and how to track it properly
- Line Shopping Guide — how to consistently get better prices before the close
- Odds Converter — convert between American, decimal, fractional odds, and implied probability
- EV Calculator — check expected value on odds you're considering
- Kelly Criterion Calculator — convert an edge into an optimal bet size
- Track Record — realized results, not just theoretical price value