Free Closing Line Value
CLV Calculator 2026

Closing Line Value (CLV) measures whether the odds you bet were better or worse than the final odds available just before the event started. The closing line is considered the most accurate measure of true probability because sharp bettors and syndicates push the market toward its correct price by kickoff.

Formula: CLV% = (Placed Odds ÷ Closing Odds − 1) × 100

If your CLV is consistently positive over a large sample, you are a long-term winning bettor — regardless of short-term results.

Any positive CLV is good. Here is how to interpret your results:

+1% to +3% — Solid edge. You are consistently finding value before the market corrects.
+3% to +6% — Excellent. You are operating at a professional level.
+6%+ — Elite. Very few bettors operate at this level consistently.
Negative CLV — You are betting into worse prices than the market consensus. Long-term loss is mathematically expected.

Track your CLV across 100+ bets to get a meaningful sample size. Use our Kelly Criterion Calculator to size your bets optimally.

For CLV tracking, you want bookmakers with sharp, efficient closing lines. The best benchmarks are:

Stake.com — Sharp lines, crypto-friendly, never restricts winners.
Polymarket — Decentralized prediction markets. True price discovery.
Stake.com — Crypto-friendly, sharp lines, fast payouts.
Polymarket — Decentralized prediction markets, best odds on major events.