Closing Line Value (CLV) Calculator
Compute how much your bet beat (or missed) the closing market price. The single most reliable signal that you're a winning bettor — averaging positive CLV almost always becomes profit over thousands of bets.
What is CLV?
Closing Line Value is the % difference between the price you took and the price at the moment the market closed. If you took 2.10 and the close was 1.95, you got +7.7% CLV — the market moved against you because more sharp money came in on your side after you bet.
The formula
Equivalently using implied probabilities:
Both formulas give identical answers. Positive CLV = you got a better price than the close. Negative CLV = the market moved away from your side.
Why CLV matters more than win rate
Variance is brutal in betting. Even a profitable strategy will lose 30 in a row sometimes; even a losing strategy will go on a 70%-hit-rate run. CLV cuts through variance because it measures whether the market agrees you got value — and the market is usually right about closing prices.
Studies of professional sportsbettors (Levitt, Wisor, Manski) consistently show: bettors with sustained positive CLV are profitable; bettors with negative CLV are not, regardless of short-run results. CLV is the leading indicator. Profit is the lagging one.
What's a good CLV?
| Avg CLV (50+ bets) | Quality | Real-world |
|---|---|---|
| ≤ 0% | Losing | You're paying the vig — long-run loss is mathematical |
| 0% to +1% | Marginal | Just covering the vig — break-even at best |
| +1% to +3% | Sharp | Reliable long-run edge after vig — pro territory |
| +3% to +6% | Very sharp | Top tipsters and professional models |
| +6%+ | Suspicious | Either small sample, stale lines, or measurement error |
TIPERO's average CLV across all graded picks since launch is publicly tracked — see the track record page for the live number.
How to use CLV in your workflow
- Bet early when you spot value, then watch the close — that's where CLV is captured.
- Always log the closing line at kickoff. Without it, your CLV history is incomplete.
- Reference a sharp book for the close. Pinnacle, Matchbook and Smarkets are the gold standard. Closing line at a soft book is meaningless because it doesn't reflect informed money.
- Average over 50+ bets minimum. A handful of CLV numbers is noise; trends emerge over volume.
- Negative CLV is a real signal — if you're consistently buying lines that drift against you, your model is underperforming the market.
CLV vs ROI — which matters more?
ROI is the truth, eventually — but it lags by hundreds or thousands of bets. CLV is the truth, immediately. They should converge: positive CLV ≈ positive long-run ROI, after accounting for vig at the books you played at. If your CLV is +3% but your ROI is −5% after 500 bets, the gap is variance and will close. If your ROI is +10% but CLV is −1%, your wins are fading and you're getting lucky.
Related tools
CLV-tracked picks for tennis
TIPERO logs the closing line for every graded pick — your CLV history is always visible. 7-day free trial, no credit card.
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What does CLV mean in betting?
Closing Line Value — the % gap between the price you took and the price at kickoff. Positive CLV means you got a better deal than the market settled at; negative means the market moved away from your side.
How do I calculate CLV?
CLV % = (your_decimal_odds / closing_decimal_odds − 1) × 100. Or equivalently with implied probabilities: (closing_implied − entry_implied) / entry_implied × 100. Same answer either way.
Why is CLV more reliable than win rate?
Win rate is volatile in small samples — variance can fake a winning record over 30 bets. CLV reflects whether informed market money agrees you got value. Sustained positive CLV almost always becomes profit; sustained negative CLV almost always becomes loss.
What's a realistic CLV target?
+1% to +3% sustained over 50+ bets is sharp territory. +4% to +6% is exceptional. Anything above +6% over a small sample is usually noise or stale-line capture, not a durable edge.
Should I use Pinnacle as the closing reference?
Yes — Pinnacle is the global standard because they take big bets without restricting winners, so their close reflects sharp money. Other sharp options: Matchbook, Smarkets (exchange), 5dimes (now closed). Avoid using soft-book closes — they don't reflect informed money.