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Closing Line Value (CLV) Calculator

Enter your decimal odds and the closing decimal odds to get the closing line value.

How it is calculated

The tool compares the odds you took with the odds at the close: CLV = (Oyou ÷ Oclose − 1) × 100, shown as a percentage with two decimals. Both prices are decimal odds and must be above 1.00 (2.10 means a 1 unit stake returns 2.10 including the stake); otherwise there is no result. A value is also accepted as American odds only when it is typed with an explicit sign and a magnitude of 100 or more, such as +110 or -120; it is converted to decimal first (+110 becomes 2.10, -120 becomes 1.83). A bare 110 is read as decimal 110, and fractions such as 11/10 are not accepted. Positive CLV means you got a better price than the close. The bookmaker's margin is not removed.

Worked example

You back a team at decimal odds of 2.10 and the price closes at 1.95. Divide: 2.10 ÷ 1.95 = 1.0769. Subtract 1: 0.0769. Multiply by 100 and the tool shows 7.69%. Your price was about 7.7% better than the close. Typing +110 in the first field gives the same result, because +110 converts to 2.10. Had you taken 1.80, you would get 1.80 ÷ 1.95 − 1 = -7.69%, a worse price than the closing line.

Try this example →

Common mistakes

  • Typing American odds without the sign (110 instead of +110): the tool then reads decimal 110 and reports a huge CLV in the thousands of percent.
  • Entering a negative American price smaller than 100 in magnitude, such as -50, or any decimal at or below 1.00: these give no result.
  • Reading CLV as the profit on the bet. It measures your price against the close, not whether the bet won, and a single bet proves little.
  • Swapping the two fields: putting the closing odds first flips the sign of the result.
  • Comparing with an early or mid-day price instead of the final close, or mixing bookmakers, so the two numbers are not comparable.

Sources

About this calculator

This calculator computes closing line value (CLV) — the percentage edge between the odds a bettor actually took and the final closing odds just before the event starts, expressed in decimal odds: CLV = (Your Odds ÷ Closing Odds − 1) × 100. Closing odds are treated as the market's most efficient, best-informed price, since they've absorbed all available money and information.

Professional sports bettors and quantitative handicappers track CLV over hundreds of bets because short-term results are dominated by variance — a bettor who consistently beats the closing line is capturing genuine pricing inefficiency, which is a far more reliable long-run skill signal than win/loss record alone.

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