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Closing Line Value (CLV) Calculator

Free CLV calculator for sports betting. Compare the sharp or closing line to your book’s line to measure closing line value, probability edge, and whether you have a real edge worth betting. Understanding what is CLV in sports betting starts here.

New to this? Start with:+EV Calculator, Odds Converter

Quick start

  1. Select your sport
  2. Enter the sharp/closing line and your line
  3. Enter odds at your book in any format
  4. Check probability edge, Kelly stake, and verdict in results

Try a quick CLV example

NBA spread: sharp -3.5 at -108 vs your -3 at -110 with $100 stake.

Determines which direction is better for your line. Spread works for both favorites and underdogs.

Sharp Book Odds (Your Side)

The odds at the sharp book for the side you are betting. This sets the true probability baseline.

The line at a sharp book (e.g. Pinnacle) or the closing line before game start.

odds format selector

Need help with odds formats? Learn this step

Converted

Decimal1.926
Fractional25/27
Probability51.92%
Your Book Odds

The odds at your sportsbook. This is what you are actually getting paid.

The line at your sportsbook when you placed or plan to place the bet.

odds format selector

Need help with odds formats? Learn this step

Converted

Decimal1.909
Fractional10/11
Probability52.38%
$
Range$0 – $1,000

CLV Results

Marginal CLV

You have a small edge over the sharp line. Consider bet sizing carefully — the vig may eat into thin edges.

Verdict

Marginal Edge

Some edge detected, but the line difference is small.

Expected Value

$1.98

Line Diff

+0.5

EV %

+1.98%

Kelly

$2.18

Line Comparison

Sharp Implied51.9%
Your Implied52.4%
In plain English

You enter the odds and line from a sharp book and the odds and line at your book. The sharp odds tell us the true probability. If your line is better, your true probability is even higher. Then we compare that to what your book is charging you — if you are paying less than the true probability, you have an edge.

Copy a link that opens this calculator with your current values.

How CLV Edge Is Calculated

Closing line value edge: how much better your line is vs. the sharp line. = True Win Prob = Sharp Implied + Line Edge, then Edge = True Win Prob - Your Implied

Sharp implied probability comes from the sharp book odds (the closest proxy for true odds in the market). The line difference adds or subtracts probability based on the sport. Your implied probability comes from the odds you are getting. If your true win probability exceeds what your odds imply, you have a real edge. Kelly: (b x p - q) / b, where b = your decimal odds - 1, p = true win prob, q = 1 - p.

How it works

  1. Enter your line and the sharp line — Your book vs. a sharp like Pinnacle at close.
  2. Enter both sets of odds — The sharp number plus what your book is paying.
  3. Read your edge — Line difference, probability edge, Kelly stake, and verdict appear together.

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Closing Line Value Guide

Learn what CLV is and how to measure your edge against the market

Closing Line Value FAQs

CLV measures how much better your line was compared to the closing or sharp line. Consistently beating the closing line is the strongest predictor of long-term betting profitability — stronger than your actual win rate.

Not on a single bet — outcomes are variance. But consistently beating the close over hundreds of bets is the clearest signal that you have an edge, even during losing stretches.

Use the closing line at your own book — the final number right before the event starts — or check a market aggregator. Pinnacle is the gold standard when you can access it.

Kelly sizes each bet in proportion to your edge and odds, so your bankroll grows as fast as possible without risk of ruin. Most bettors use fractional Kelly (25–50%) to dampen variance while still capturing the edge.

Matching the sharp line means the market agrees on the probability, but you still pay your book’s vig. Unless you have a separate reason to believe the true probability is higher than the sharp implied, there is no edge to act on.

CLV, or closing line value, measures how your line compares to the final market price right before a game starts. In sports betting, getting a better number than the closing line is widely considered the strongest indicator of long-term edge. A positive CLV means the market moved in your favor after you bet.

Closing line value (CLV) measures how your bet odds compare to the closing odds at kickoff. Positive CLV means you got a better price than the market settled at — a strong indicator of long-term profitability.

CLV = ((Closing Implied Probability − Your Bet Implied Probability) / Your Bet Implied Probability) × 100. Our free CLV calculator does this instantly.

Positive CLV is the best predictor of long-term edge, but short-term results will vary due to variance. Tracking CLV across 500+ bets gives a statistically meaningful sample.

Most sharp bettors target an average CLV of +2% or higher over hundreds of bets. A consistent CLV between +1% and +3% indicates a sustainable edge; +3% or higher across a large sample is exceptional. Any negative average CLV over 200+ bets is a strong signal the strategy is losing to the closing line.