How to Find Fair Odds With a No-Vig Calculator | OddsGuard
Strip sportsbook margin from both sides of a line to find true fair odds.
By OddsGuard Editorial · Published
Short answer
Closing line value is the difference between the price you bet and the final price before the game starts. If you regularly get better prices than the closing line, you are likely making good bets — even through a short-term losing streak.
Why the closing line matters
The closing line is the market's last and best-informed price, shaped after injury news, weather, and sharp money have all been priced in. Beating it over many bets is one of the strongest signs a bettor has a real pricing edge, because win-loss records swing wildly over small samples while CLV settles down much faster.
How to calculate it
Compare the implied probability of the price you locked in against the closing price:
- You bet Team A at +150 (implied probability 40.00%).
- The line closes at +130 (implied probability 43.48%).
- Your CLV is 43.48% - 40.00% = +3.48 percentage points in your favor.
Measuring CLV on spreads and totals
If you bet -3 and the spread closes at -4, you gained a full point of CLV. For a sharper read on fair probability, strip the vig from the closing line first using the No-Vig Calculator before comparing.
How line shopping improves CLV
Your CLV starts the moment you choose which sportsbook to bet at. If one book offers +150 while another offers +140 on the same side, placing your bet at +150 gives you a stronger starting edge against the exact same closing line.
How to track it
- Log the exact odds and spread/total you got when you placed each bet.
- Record the closing price at kickoff or tipoff from the same book or a sharp market-making sportsbook.
- Review your average CLV over at least 100 bets before drawing conclusions from short-term results.
Frequently Asked Questions
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