Closing line value explained: compare your price with the close

The closing line is a reference price near the start of the event. CLV compares the price you accepted with that reference. Decide which bookmaker, market and timestamp count as your close before analysing results.

Here we use decimal price ratio: CLV = (accepted odds ÷ closing odds − 1) × 100. Different services use other definitions, including changes in implied probability or margin-adjusted prices. A percentage without its formula is ambiguous.

With a ₦1,000 stake, the accepted price returns ₦2,100 if the bet wins. The reference price would return ₦1,950. That ₦150 difference is hypothetical payment on a win, not money earned just because the price moved.

If the selection loses, your original bet still loses ₦1,000. Positive CLV and a losing result can occur together. Negative CLV and a winning result can also occur together.

Missing closing prices should remain missing. Substituting a live price after a goal introduces information that did not exist at kick-off. Record rejected bets separately from accepted ones.

Look at multiple bets, actual profit, stakes, the markets involved and the consistency of your price source. An attractive average from a few selected winners does not describe a full method.

A closing price is still a market estimate. It contains margin and may be an imperfect reference. This article’s raw price ratio does not establish the true probability or the expected yield of your bets.

For a useful audit, preserve both the accepted price and the closing snapshot. Keep the chosen formula unchanged through the period, and explain any change of reference operator. That makes the metric reproducible instead of a label attached after the result.