Closing line value calculator

Closing line value (CLV) compares the odds you took with the odds at the start of the game. Enter both, and the closing odds on the other side too if you want the margin taken out.

Your odds Closing odds, your side Closing odds, other sideoptional: takes out the margin

CLV

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your price vs the close

Beat the close by

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implied chance, closing minus yours

Fair closing chance

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no-vig, needs the other side

EV at the fair close

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if the close was the true chance

How it works

What CLV measures

The closing line is the last price before the start, when the market has taken in the most money and news. Taking +110 on a side that closes at -105 means you got a better price than the final market: your decimal odds 2.10 against its 1.95, a CLV of +7.6%.

Beat the close by

The same comparison in implied chance: -105 is 51.2%, +110 is 47.6%, so you beat the close by 3.6 points. A negative number means the price got better after you bet.

Taking out the margin

The closing price on your side still includes the book's margin. With the other side's closing odds, the margin comes off in proportion (as in the no-vig calculator): -105 / -115 gives 48.9% fair for your side. Treating that as the true chance, a bet at +110 has an expected value of +2.7%.

Why bettors track it

Results swing a lot over a few hundred bets; CLV settles much faster. Bettors who regularly beat the close tend to win over time, because sharp closing lines are a good estimate of the real chances. It's a guide, not a guarantee: a single bet that beat the close can still lose. Closing lines for finished games are on each game page and the results pages.

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Parlay calculatorOdds and payout for a parlay of up to 15 legs, with pushes. Round robin calculatorEvery parlay in a round robin: how many bets, the risk and the payout. Bet payout calculatorWhat a bet pays at American odds, or what to risk to win a set amount. Odds converterAmerican, decimal and fractional odds and implied probability. No-vig fair odds calculatorTake the vig out of a market: fair odds, fair win % and the hold. Hedge calculatorHow much to bet on the other side to lock in a profit or get your stake back. Expected value calculatorA bet's expected profit from the odds and your win probability. Kelly criterion calculatorHow much of your bankroll the Kelly criterion says to bet. Arbitrage calculatorStakes across two or three prices that pay the same whatever happens. Prediction market calculatorAny prediction market price as odds after its fee, next to a sportsbook's.

For information only: check every figure with your sportsbook or exchange before you bet. Calculators can't make a bet a good one, and only bet what you can afford to lose.