CLV Calculator — Closing Line Value
Results are noisy; prices are not. Closing line value shows whether the odds you took were better than where the market finally settled — the fastest feedback on whether your betting has an edge. Enter your price and the closing odds on both sides to see your CLV.
The formulas
closing probability = (1/closeDec) / (1/closeDec + 1/oppositeDec) CLV % = bet decimal × closing probability − 1 CLV pts = closing probability − your implied probability
Worked example
You bet +110 (implies 47.62%). The market closes -110 / -110, a fair 50% each. Your CLV is 2.10 × 0.50 − 1 = +5.00%, or +2.38 probability points — you beat the close.
- Track CLV bet by bet in the bet tracker.
- Get the fair closing line with the no-vig calculator.
- Turn an edge into a stake with the Kelly calculator.
FAQ
What is closing line value (CLV)?
CLV compares the price you bet with the final price before the game starts. If you got better odds than the closing line, you beat the market — historically one of the best signs of a profitable bettor, because closing lines are the most efficient prices.
How is CLV calculated?
Remove the vig from the closing line to get a fair closing probability, then compute your bet's decimal odds × that probability − 1. Betting +110 on a side that closes at a true 50% is +5.00% CLV.
Why does the calculator ask for the other side's closing odds?
Closing prices include the sportsbook's margin. With both sides, the margin can be removed to get a fair closing probability. Without it, the closing probability is inflated and CLV is overstated.
Does positive CLV mean my bet won?
No. CLV measures price quality, not results. You can beat the close and lose a single bet, and win a bet at a worse price than the close. It matters over many bets.