Closing Line Value (CLV): The Metric That Actually Measures Skill
Win rate is a terrible short-term scoreboard: a good bet loses all the time, and you'd need hundreds of results before your record means anything. Closing line value (CLV) is the metric sharp bettors actually track, because it tells you whether you're beating the market long before your bankroll does.
What closing line value measures
The closing line is the last price a market shows before it starts, the sharpest public estimate of the true probability, because it has absorbed all the money and information right up to kickoff. CLV compares the price you got to that closing line. If you consistently beat the close, you're consistently finding value, whatever any single result says.
Why CLV beats win rate
Outcomes are mostly noise. A real edge of a couple percent is invisible in a small win-loss sample and can stay underwater for a long time by pure variance. CLV, measured against the de-vigged closing line, is observable on every bet immediately and converges far faster than profit. It's the standard sharpness test for exactly that reason, and it's why books limit players who beat the close, win or lose.
How to measure it honestly
Grade against the de-vigged closing line, not the raw closing price. You have to take the vig out of the benchmark too, or you'll flatter every bet. Compare your price's implied probability to the fair closing probability; beating it is positive CLV. The Report Card below does this for each bet, grades it A to F, and shows every step of the arithmetic.
Worked example: grading a bet on CLV
Frequently asked questions
What is closing line value?
Closing line value (CLV) is the difference between the price you got on a bet and the market's closing price, measured against the de-vigged closing line. Beating the close means you found value.
Why is CLV better than win rate?
Real edges are small and outcomes are noisy, so win rate takes hundreds of bets to mean anything. CLV is measurable on every bet and converges much faster.
How do you calculate closing line value?
Compare your price's implied probability to the fair probability from the de-vigged closing line. If your price implies a lower probability than the fair close, that's positive CLV.
Do sportsbooks limit players for beating the closing line?
Books commonly limit accounts that consistently beat the close, because CLV signals a long-term winner regardless of short-term results.