Line Movement: What 'Moved' Means on a Prop
The number can move, and so can the price
A line can move in two ways. The number changes, for example from 24.5 points to 26.5. Or the number stays and the price shifts, for example the over going from -110 to -130. Either one says the book now sees the two sides differently.
- Number moved
- 24.5 to 26.5, up 2.0
- Implied chance of the over at -110
- 52.38%
- Implied chance of the over at -130
- 56.52%
- Price move in points of implied chance
- 4.1 points
Compare prices as implied chances, not as raw odds: a move from -110 to -130 is 4.1 points of implied chance, while a move from +300 to +280 is only 1.3.
What moves a line
- News: an injury, a lineup change, a weather report, or a teammate ruled out changes a player's expected role.
- Money: books adjust after they take bets, and they copy each other.
- Time: early numbers are posted with less information, and lines usually tighten toward game time.
A move does not tell you which side is right. Late in the day it often just means the number caught up with what everyone knew.
How the site shows it
Each prop shows a Moved tile, the consensus number now against the first one we stored, and a timeline of the shared number replayed from stored snapshots. The Biggest line moves panel lists the largest changes for games that have not started. Prop lines cannot be backfilled, so a prop's history starts on the day we first pulled it, and movement is market data, not a pick.
Questions and answers
- What does it mean when a prop line moves?
- The book changed the number or the price after first posting it. It reflects new information or new money, and it does not by itself say which side will win.
- What is the difference between a line move and a price move?
- A line move changes the number (24.5 to 26.5). A price move keeps the number and changes what each side pays (over -110 to -130). Both change the implied chance.
- Is a big line move a signal to bet?
- No. Probetrics shows movement as market data. A large move can mean real news or simply a book catching up with others, and past moves do not predict the result.
Read next
- Implied probabilityImplied probability is the chance a price says an outcome has, found by converting the odds, and it puts American, decimal and fractional prices on one 0 to 100% scale.
- No-vig oddsNo-vig odds, also called fair odds, are a two-sided price with the sportsbook's margin (the vig, or juice) taken out, so the two sides' chances add up to 100%.
- MiddleA middle is a gap between two sportsbooks' numbers on the same prop, such as one book's over 24.5 and another's under 26.5, where a result inside the gap wins both sides.
- Alternate lineAn alternate line is a different number for the same prop than the main line, priced to match: an easier number pays less, a harder number pays more.
This page explains arithmetic and vocabulary. It does not recommend a bet, a side, an amount or a sportsbook, and the examples are illustrations. For information only, not betting advice. 21+ only. Gambling problem? Call or text 1-800-GAMBLER.