Closing Line Value Calculator
Measure how much you beat the closing odds.
How it works
Closing line value (CLV) measures the gap between the odds you took and the final closing odds. If your price was longer than the close, you beat the line — a sign you found value before the market corrected. Sharp bettors track it as the single best predictor of long-term profit.
CLV is the percentage by which your odds beat the close: your odds ÷ closing odds − 1. Positive means value, negative means you were on the wrong side of the move. Consistently positive CLV over a large sample matters far more than the result of any one bet.
Closing Line Value Calculator
Closing line value (CLV) is the gap between the odds you bet at and the final odds at the off. This free CLV calculator measures it instantly — the single statistic sharp bettors trust most to tell whether they are beating the market over time.
Why closing line value matters
The closing line is the market's most accurate estimate of an event's true odds, set after all the money and information have arrived. If you consistently took longer odds than the close, you were getting value before the market corrected — and value, repeated, is what produces profit.
A single result is noise; CLV is signal. You can lose a bet you should have won and still have made a great bet if you beat the closing line, because over a large sample positive CLV reliably turns into profit.
How it is calculated
CLV is the percentage by which your odds beat the close: your odds ÷ closing odds − 1. Back a team at 2.20 that closes at 2.00 and your CLV is +10%. The calculator also shows the implied probability of each price so you can see how far the line moved in your favour.
Track CLV across every bet, not the win rate, to judge whether your process is sound. Positive average CLV means you are a genuine market-beater even before the results catch up.
What is closing line value?expand_more
The difference between the odds you bet and the closing odds. Beating the close — taking longer odds than the final price — is a strong sign of long-term edge.
How do you calculate CLV?expand_more
CLV = your odds ÷ closing odds − 1. Betting at 2.20 on a line that closes at 2.00 gives +10% closing line value.
Why is CLV more important than winning a bet?expand_more
Any single bet is mostly variance. Positive CLV across a large sample reliably predicts profit, so it measures the quality of your decisions rather than the luck of one result.