Free closing line value (CLV) calculator and tracker. Compare your odds to the closing line, log your bets, and see your average CLV and beat rate.
The closing line is the market's final, sharpest price. If you consistently bet at better prices than the close, you are beating the market — and CLV is the strongest available predictor that your results are skill, not luck.
You can lose a bet and still have positive CLV. Over a large sample, a bettor who beats the close wins; one who is beaten by the close loses, regardless of how individual bets land.
Any positive average CLV means you are beating the market. Pros often run at 1–3% average CLV, which compounds over volume.
Over small samples, yes — win/loss is noisy, while CLV stabilizes far faster and tells you whether your process is sound.