Closing Line Value Calculator

What closing line value is

The closing line is the last price before an event starts, after all the money and information have gone in. It is the most accurate prediction the market produces. Closing line value measures whether the price you took was better than that final price. Consistently taking better prices than the close is the clearest evidence that you are finding real edges rather than getting lucky.

Why it matters more than win rate

Results are noisy. A good bettor can lose over a hundred bets and a bad one can win over a hundred. Closing line value is far less noisy, because it measures the quality of the decision rather than the outcome. If you consistently beat the close, profit follows given enough volume. If you consistently lose to the close, no amount of short-term winning will hold up.

How to read the number

A positive figure means you took a better price than the market settled on. A few percent consistently is strong. The level matters less than the consistency: a bettor averaging plus one percent across hundreds of bets is in far better shape than one who hit plus fifteen on a handful and negative on the rest.

The honest caveat

This compares raw prices, which include the sportsbook margin on both sides. A stricter method removes the vig from both before comparing, which gives a cleaner figure. The simple version here is directionally right and is what most bettors use day to day; just be aware it flatters slightly, because you are measuring against a price that also contains margin.

Using it to assess a handicapper

Ask whether they record the closing line. Almost none do, because it is the one metric that cannot be presented selectively. A record showing closing line value alongside results is making a much stronger claim than one showing wins and losses alone, and it is the question that separates people tracking their work from people marketing it.