Free calculator
Closing line value calculator
Compare the price you took with a recorded closing price for the exact same selection and market. This free tool uses decimal odds and does not fetch or verify closing lines.
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How to calculate price-based CLV
CLV = (taken decimal odds / closing decimal odds - 1) × 100. Positive values mean you took a higher payout than the quoted close; negative values mean a worse payout.
Worked closing line value example
Fictional example: taking 2.10 before a market closes at 2.00 gives (2.10 / 2.00 - 1) × 100 = +5.00% price-based CLV. The implied probability moves from 47.62% to 50.00%, a separate +2.38 percentage-point change.
Compare the same market and line
Use the same player or team, event, market, handicap, settlement rules and time convention. A bet at -3.5 and a close at -4.5 cannot be compared by price alone. Pushes, commissions and sportsbook margin are not adjusted here.
CLV is a process measure
Beating a recorded close does not prove a true edge or guarantee profit. The close can be wrong. Keep timestamped prices and all results over a meaningful sample; do not select only winning examples.
Common questions
Does this calculator guarantee a profit?
No. Examples are fictional and calculations depend on the prices, probabilities and settlement assumptions you enter. No betting profit is guaranteed.
Do I need a paid membership?
No. This calculator and its examples are available without signing up. A free account adds a personal pick tracker; membership is optional.
Research involves uncertainty. Review membership pricing, results and refund terms before joining. No subscription guarantees wagering returns.