Definition
The spread, or point spread, is a handicap applied by bookmakers to level the perceived difference between two teams. Bettors wager on whether the favored team will win by more than the spread, or the underdog will lose by less than it.
In context
A point spread gives one team a virtual head start and the other a virtual deficit. If the Lakers are -7.5 against the Bulls, a bet on the Lakers wins only if they win by 8 or more, while a bet on the Bulls wins if they lose by 7 or fewer or win outright.
The spread is set to attract roughly equal action on both sides, which lets the bookmaker profit from the vig regardless of outcome.
Spreads are most popular in American football and basketball, where scoring is high enough to make fine-grained handicaps meaningful. The line is set by the bookmaker trading team and adjusted in real time based on betting volume, injury news, and sharp action.
A line that moves from -7.5 to -9 indicates heavy money on the favorite, while reverse movement can signal sharp money on the underdog.
Spread betting is less common in soccer and other low-scoring sports, where Asian handicaps fill a similar role. For operators, spread markets are a major revenue driver during NFL and NBA seasons, with single marquee games generating millions in handle.
Live spread betting, where the line updates after every score, has grown rapidly with in-play wagering and now accounts for a large share of US sportsbook handle.
Common operator mistakes include slow line updates during live games, which expose the book to sharp bettors, and weak risk controls on correlated parlay markets. Affiliates should understand that spread betting is the entry product for US-facing sportsbooks and a core traffic-converting angle during football season.
Push outcomes, where the spread lands exactly on the final margin, refund the stake and should be clearly disclosed.
Worked example
An NFL book sets the Chiefs at -3.5 against the Bills. A bettor who backs the Chiefs needs them to win by 4 or more for the bet to pay.
Related terms
Frequently asked questions
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