The point spread is where most of the money in American sports betting goes, and it is the market new bettors get wrong most often. The spread is not a prediction of the final score. It is a handicap the book applies to the favorite so that both sides draw money. Once you see it that way, the rest of this guide is just details.
What the Spread Actually Does
A spread takes points away from the favorite and gives them to the underdog. The book’s goal is a number where a well-informed bettor would find either side about equally attractive. If the book gets that right, it takes roughly equal money on both teams, pays the winners with the losers’ money, and keeps the vig.
That is why the spread does not always match the “true” margin. If the public loves a team, the book may shade the line a half point past what the matchup deserves, because it is managing its own risk, not forecasting the game.
Chiefs -6.5 Worked Through
Say the board reads Chiefs -6.5, Raiders +6.5. Bet the Chiefs and they have to win by 7 or more for you to cash. Bet the Raiders and you win if they win outright or lose by 6 or fewer.
The half point exists so the game cannot land exactly on the number. At a whole number like -7, a seven-point Chiefs win is a push and everyone gets their money back. At -6.5 there is no push. Books like half points because every ticket gets decided; bettors should like whole numbers more than they usually do, because a push beats a loss.
Why Both Sides Cost -110
A standard spread is -110 on each side. You risk $110 to win $100. If the book takes $110 from a Chiefs bettor and $110 from a Raiders bettor, it pays the winner $100 and keeps $10 no matter who covers.
That $10 is why you need to win 52.4% of your spread bets just to break even. A book posting -105 cuts the break-even to 51.2%. SportsBetting.ag posts a standing -105 on NFL and NBA sides, and over a few hundred bets that difference is worth more than most handicapping.
In practice the money is never perfectly balanced. Books move the line or the price to attract bets on the lighter side, and sometimes they are happy to hold a position against the public.
Winning the Game and Covering Are Different Things
This is the distinction that costs new bettors the most. A team can win and not cover. If the Chiefs are -9 and win 20 to 14, they won by 6, so the Raiders +9 cashes and the Chiefs ticket loses.
It runs the other way too. A team can lose the game and cover the spread. Raiders +9 losing 20 to 14 is a winning bet for everyone who took Kansas City’s opponent. When you bet a spread you are not betting on who wins. You are betting on the margin.
How and Why the Line Moves
Lines move for two reasons: money and news. A game can open Chiefs -5.5 on Monday and close -7 on Sunday. Sometimes that is heavy public money. Sometimes it is a few large bets from accounts the book respects. Sometimes a starting quarterback was ruled out on Wednesday.
Reading the move matters because the number you bet is the number you are graded on. If you took the Chiefs at -5.5 and the line closed -7, you hold a better ticket than anyone who bet Sunday morning. Books that post early, and BetOnline is the one in our group that does it consistently, give you the chance to grab a number before the market pushes it.
Key Numbers: 3 and 7
NFL games are decided by 3 points more often than any other margin, and by 7 points second most often, because of the way scoring works: field goals are worth 3 and touchdowns with the extra point are worth 7. That makes a spread of 3 or 7 different from a spread of 4 or 8.
The half point around those numbers carries real value. Chiefs -2.5 wins on a field-goal margin; Chiefs -3 pushes on it. Chiefs -6.5 wins on a one-touchdown margin; Chiefs -7 pushes. Most books charge extra to buy a half point on or off 3 and 7, and some will not sell it at all, which tells you how much it is worth. In the NBA and college football the same idea applies with less force, because scoring is more varied.
Where to Bet Spreads
Spread betting rewards two habits: getting the right number and paying the least for it. BetOnline posts lines early, SportsBetting.ag charges -105 instead of -110, and keeping an account at both lets you take whichever is better on a given game. Compare them and the rest of the books we cover in our sportsbook reviews.