A point spread is the most popular form of sports betting, serving as a reference for how oddsmakers and the betting public view one team relative to another. It creates a 50/50 proposition by assigning a winning margin that the favorite must cover, while the underdog can lose by fewer points than the spread or win outright.
How Point Spreads Work
Oddsmakers set the spread based on team strength, injuries, and other factors. For example, a matchup between the New England Patriots and Seattle Seahawks might have a spread of 3.5 points with Seattle favored. Bettors backing the Seahawks need them to win by four or more points; those backing the Patriots win if New England wins outright or loses by three or fewer points. Spread odds are typically -110 on both sides (wager $110 to win $100), whereas money line odds for the same favorite might be -185 (wager $185 to win $100), reflecting the different risk profiles.
When Spread Lines Change
Lines move when a large portion of bets favors one side, prompting sportsbooks to adjust the spread to balance the handle. Sharp bettors with strong winning records can also influence line movement, as can injuries to star players or lineup changes. Competing sportsbooks' lines are also monitored for adjustments.
Spreads Across Different Sports
Point spreads are common in NFL, college football, NBA, and college basketball. In baseball, spreads are called run lines and usually set at 1.5 runs; the favorite on the run line often carries plus odds, while the underdog carries minus odds. For instance, the Texas Rangers might be -164 on the money line but -1.5 at +138 on the run line, with the Milwaukee Brewers at +1.5 and -169. Hockey uses puck lines similarly. Soccer spreads are generally used only for heavy favorites, and tennis offers sets spreads (e.g., -1.5 sets for the favorite).
Betting Tips and Advice
In college football, top teams often schedule weak non-conference opponents, creating massive spreads up to 50 points. These lines are best avoided because the required wager is large for a small return. Betting on home underdogs is historically profitable in college sports, as teams play better in front of their fans. In professional leagues, home-field advantage is less pronounced due to player professionalism. Parlaying spread bets is allowed but generally not advised because the implied win probability is not properly reflected in the odds, and one losing leg sinks the entire bet.
Frequently Asked Questions
Point spread bets carry risk like all sports betting, but no evidence suggests they are riskier than other markets. The randomness of late-game events can affect outcomes, but that risk exists across all betting types. Parlays are permitted at most sportsbooks, though they are not recommended. Bettors can place spread bets at any reputable sportsbook; shopping for the best lines is wise. Most spread bets come with -110 odds on both sides, implying a roughly equal chance for each side to cover.
