This CLV calculator measures closing line value: how the odds you took compare with the final odds just before the event began, known as the closing odds.
The closing price is usually the market’s best estimate, so if you regularly beat it, your prices are probably good ones, even while your results go up and down.
Closing line value calculator
Key points
- Raw CLV = odds taken ÷ closing odds − 1.
- No-margin CLV uses the closing price with the margin taken out.
- Positive CLV over many bets is a good sign, not a promise of profit.
Using the calculator
Enter the odds you took and the closing odds for the same outcome to get raw CLV.
Then add the closing odds for the other side, or both other sides in a three-way market. The calculator removes the margin from the close and also shows your CLV against that fairer price.
Worked example
Worked example
You backed over 2.5 goals at 2.05 in Brighton v Newcastle (prices for illustration only). The market closed at 1.90 for over and 1.95 for under.
Raw CLV = 2.05 ÷ 1.90 − 1 = +7.9%.
The close carries a margin, though. The book is 1 ÷ 1.90 + 1 ÷ 1.95 = 103.9%, so the no-margin close for over is 1.97, and against that your CLV is 2.05 ÷ 1.97 − 1 = about +3.8%.
Reading the results
A single bet with good CLV may not land, and one with poor CLV can still come in, so judge your average CLV over hundreds of bets instead. Our closing line value guide explains why it settles faster than profit.
The no-margin figure is the stricter test, so it is the one to trust, and closing prices from busy markets such as the Betfair Exchange give the clearest signal. The idea rests on markets being fairly efficient by the close.
CLV and your records
Log the closing odds next to every bet and check your average CLV each month. The betting ROI calculator tracks your results, CLV tracks the quality of your prices, and the fair odds calculator shows the same margin maths for a whole market. The free Bet Tracker works out CLV for you as you go.
Related guides and calculators
18+ only. Betting should stay fun. Set a budget before you start, only bet what you can comfortably afford, and take a break whenever you need one. For free, confidential support, visit BeGambleAware.org or call the National Gambling Helpline on 0808 8020 133.