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Closing Line Value (CLV) Calculator

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

Result

7.69%

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.

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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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