How Spread Betting Works
Spread betting is the most popular way to bet on team sports in the United States. Walk into any sportsbook in Las Vegas or on your phone, and the spread is front and center on almost every game.
Yet for new bettors, the spread can be confusing at first glance. This guide explains exactly what it is, how it works, and how to use it to make smarter bets.
What Is a Point Spread?
When two teams play each other, they are rarely evenly matched. One side is almost always the favorite, and one is the underdog. If sportsbooks simply offered a straight win/loss bet on every game, it would not be as entertaining.
The point spread solves this problem by giving the underdog a head start and asking the favorite to win by a certain margin. Instead of just picking who wins, you’re picking who covers the spread.
Here’s a simple example. The Kansas City Chiefs are playing the Las Vegas Raiders. The Chiefs are heavy favorites.
| Team | Spread | Moneyline |
|---|---|---|
| Kansas City Chiefs | -7.5 (-110) | -320 |
| Las Vegas Raiders | +7.5 (-110) | +255 |
The Chiefs are -7.5, meaning they need to win by 8 or more points for a bet on them to cash. The Raiders are +7.5, meaning they can lose by up to 7 points and a bet on them still wins. Both sides are offered at -110, meaning a $100 bet profits $91 on either side.
How to Read a Point Spread
A point spread always has two components: the number itself and the odds attached to it, which is almost always -110 on standard markets.
The number tells you the margin. The minus sign next to a team’s spread means they are the favorite and need to win by more than that number. The plus sign means the team is the underdog and can lose by up to that number.
| Spread | What it means | For the bet to win |
|---|---|---|
| -7.5 | Favorite by 7.5 points | Must win by 8 or more |
| -3 | Favorite by 3 points | Must win by 4 or more |
| -1.5 | Slight favorite | Must win by 2 or more |
| +1.5 | Slight underdog | Can lose by 1 or win outright |
| +3 | Underdog by 3 points | Can lose by 2 or fewer, or win |
| +7.5 | Underdog by 7.5 points | Can lose by 7 or fewer, or win |
The -110 attached to each side is the juice. You’re paying $110 to win $100, or on a $100 bet you profit $91. That extra amount is the sportsbook’s margin, and it applies to both sides equally on a standard spread.
Covering the Spread
In spread betting, the key phrase is covering the spread. A team covers when they beat the number set by the sportsbook, regardless of whether they win or lose the actual game.
Take these examples from a single NFL Sunday:
| Game | Spread | Final score | Did the favorite cover? |
|---|---|---|---|
| Eagles -6.5 vs Giants | Eagles -6.5 | Eagles 27, Giants 13 | Yes, won by 14 |
| Bills -3 vs Dolphins | Bills -3 | Bills 24, Dolphins 22 | Yes, won by 2… wait |
| Cowboys -10 vs Commanders | Cowboys -10 | Cowboys 31, Commanders 28 | No, won by only 3 |
| Ravens -7 vs Browns | Ravens -7 | Browns 17, Ravens 14 | No, Ravens lost outright |
In the Bills example, the Bills won the game but only by 2 points. Since the spread was -3, they did not cover. A bet on the Bills -3 loses even though the Bills won the game. A bet on the Dolphins +3 wins even though the Dolphins lost. This is one of the most important concepts for new spread bettors to internalize.
When the Spread Lands on the Number
When a sportsbook sets a spread at a whole number like -3 or -7, there is a chance the favorite wins by exactly that margin. When this happens, the bet is called a push and all stakes are refunded in full. Nobody wins, nobody loses.
To avoid pushes, sportsbooks frequently set spreads at half-point numbers like -3.5 or -7.5, since no game can end with half a point. These half points are sometimes called the hook, and they matter more than many bettors realize.
| Spread | Final margin | Result |
|---|---|---|
| -3 | Favorite wins by 3 | Push, stake refunded |
| -3.5 | Favorite wins by 3 | Underdog covers |
| -3.5 | Favorite wins by 4 | Favorite covers |
| -7 | Favorite wins by 7 | Push, stake refunded |
| -7.5 | Favorite wins by 7 | Underdog covers |
Getting -3.5 instead of -3 on a favorite, or +3.5 instead of +3 on an underdog, can be the difference between winning and losing a bet. This is one of the main reasons experienced bettors shop across multiple sportsbooks to find the best number available.
Point Spreads vs. Moneylines
New bettors often wonder when to use the spread and when to use the moneyline. The answer depends on the situation and what you’re trying to accomplish with the bet.
| Situation | Spread or moneyline | Why |
|---|---|---|
| Betting a heavy favorite | Spread | Moneyline pays very little; spread gives better value |
| Betting a big underdog to win outright | Moneyline | You get full underdog odds rather than -110 |
| Evenly matched game | Either | Spread and moneyline offer similar value |
| Confidence in a team winning but not by much | Underdog moneyline or favorite spread with caution | Margin matters |
| Parlay building | Spread | Consistent -110 odds make parlays easier to calculate |
A $100 bet on a -350 favorite moneyline profits only $29. That same team as a -7.5 spread favorite pays $91 on a $100 bet, but they need to win by 8 or more. Which bet makes more sense depends entirely on whether you think they’ll win comfortably or just barely.
How Sportsbooks Set the Spread
Sportsbooks employ teams of analysts, statisticians, and traders whose sole job is to set accurate point spreads. They factor in everything from injury reports and weather forecasts to historical performance, travel schedules, and betting patterns from sharp professional bettors.
The opening spread is released days before a game and is designed to attract roughly equal betting action on both sides. When more money comes in on one side, the sportsbook adjusts the line to balance their exposure.
| Factor | How it affects the spread |
|---|---|
| Key injury (starting QB, star player) | Can move the line by 3 to 7 points |
| Home field advantage | Typically worth 2.5 to 3 points |
| Weather (outdoor games) | Heavy wind or rain can tighten spreads |
| Sharp betting action | Can move the line by 0.5 to 2 points |
| Public betting imbalance | Book adjusts to protect against one-sided exposure |
Understanding why a line moves is just as important as knowing where it moved to. A line that opens at -3 and moves to -5 without any obvious news suggests professional bettors have come in heavily on the favorite.
Key Numbers in Spread Betting
In football, certain margins of victory come up far more often than others due to the scoring structure of the game. These are called key numbers, and they are central to how sharp bettors evaluate spreads.
| Key number | Why it matters |
|---|---|
| 3 | The most common margin in NFL history; a field goal difference |
| 7 | The second most common; a touchdown plus extra point |
| 10 | A field goal plus a touchdown |
| 6 | Two field goals or a touchdown without the extra point |
| 14 | Two touchdowns |
Getting +3.5 instead of +3 on an underdog is enormously valuable because it means your bet wins on all games decided by a field goal, not just those decided by more. Paying attention to where a spread sits relative to these key numbers is one of the most practical edges available to recreational bettors.
Spread Betting Across Different Sports
While the spread is most associated with football, it exists across all major American sports, though the numbers and terminology differ.
| Sport | Spread called | Typical range | Example |
|---|---|---|---|
| NFL football | Point spread | 1 to 14+ points | Patriots -6.5 |
| College football | Point spread | 1 to 30+ points | Alabama -17.5 |
| NBA basketball | Point spread | 1 to 12+ points | Lakers -5.5 |
| College basketball | Point spread | 1 to 15+ points | Duke -8 |
| NHL hockey | Puck line | Always 1.5 goals | Bruins -1.5 |
| MLB baseball | Run line | Always 1.5 runs | Yankees -1.5 |
Hockey and baseball use fixed spreads of 1.5 rather than a variable number, which changes the dynamics significantly. A team listed at -1.5 on the puck line needs to win by 2 or more goals, which happens less than half the time even for strong favorites. The odds attached to fixed run lines and puck lines vary widely to compensate.
Common Mistakes Spread Bettors Make
Ignoring the juice. Betting -110 on every game means you need to win more than 52.4% of your bets just to break even. Many bettors focus entirely on picking winners without accounting for the built-in cost of every bet.
Chasing key numbers in the wrong direction. Paying -115 to get a favorite from -3 to -2.5 is usually not worth it. Paying -115 to get an underdog from +2.5 to +3 often is. Direction matters when crossing key numbers.
Treating a winning team as a winning bet. The most common mistake among new spread bettors is conflating a team winning a game with a bet on that team winning. A team can win the game and still lose you money if they don’t cover.
Overvaluing recent results. Sportsbooks adjust their lines to account for public perception of hot and cold teams. A team that just won three straight games in blowout fashion will attract heavy public money, which often makes the other side the sharper play.
Betting too many games. Spread betting at -110 requires a high win rate to be profitable. Betting 15 games a week spreads your attention thin and increases the chance of making careless decisions. Most sharp bettors are highly selective about which games they play.
A Real Example – Betting the NFL Week 1 Spread
The San Francisco 49ers are playing the Dallas Cowboys in a nationally televised opener. The line looks like this:
| Team | Spread | Juice | $100 bet profits | $100 bet total payout |
|---|---|---|---|---|
| San Francisco 49ers | -4.5 | -110 | $91 | $191 |
| Dallas Cowboys | +4.5 | -110 | $91 | $191 |
The 49ers are 4.5 point favorites. For a bet on the 49ers to cash, they need to win by 5 or more points. For a bet on the Cowboys to cash, Dallas needs to lose by 4 or fewer, or win the game outright.
The final score is 49ers 28, Cowboys 24. The 49ers win the game, but only by 4 points. The spread was -4.5, so the 49ers did not cover. Every bet on the 49ers -4.5 loses. Every bet on the Cowboys +4.5 wins, despite Dallas losing the game.
This is spread betting in its purest form. The result of the game and the result of the bet are two entirely separate things.
Key Terms Glossary for Spread Betting
These are the terms you will see most often when betting the spread at any US sportsbook.
Point spread is the margin set by the sportsbook that the favorite must win by for a bet on them to cash, or that the underdog must stay within for a bet on them to cash.
Cover means beating the spread. A team covers when they win by more than the spread as a favorite, or lose by less than the spread as an underdog.
Push happens when the final margin lands exactly on the spread number. All stakes are returned and no money changes hands.
Hook is the half point added to a spread to eliminate the possibility of a push. Getting or giving the hook on a key number can significantly change the value of a bet.
Key numbers are the margins of victory that occur most frequently in a given sport due to its scoring structure. In the NFL, 3 and 7 are the most important key numbers.
Juice is the commission charged by the sportsbook on every bet, typically -110 on standard spread markets. It means you must win more than 50% of your bets to be profitable.
Opening line is the initial spread posted by the sportsbook when the market first goes live, before public betting and new information push it in one direction.
Closing line is the final spread at kickoff after all betting activity has been accounted for. Beating the closing line consistently is a strong indicator of long-term betting skill.
Line movement is when the spread shifts between the opening line and the closing line in response to betting volume, injuries, or other new information.
Against the spread (ATS) is a record that tracks how often a team covers the spread rather than simply how often they win. A team can have a strong straight-up record but a poor ATS record, or vice versa.
Puck line is the hockey equivalent of a point spread, fixed at 1.5 goals with variable odds on each side.
Run line is the baseball equivalent of a point spread, fixed at 1.5 runs with variable odds on each side.
What I think of spread betting
Senior Sports Betting Analyst
If there’s one bet I’d tell a complete beginner to learn first, it’s the point spread. Not moneylines, not parlays but the spread. It’s the backbone of how most serious sports bettors actually think about games.
The concept is straightforward. The favorite doesn’t just have to win, they have to win by enough. The underdog doesn’t have to win outright, they just have to keep it close. That one twist changes everything about how you analyze a game and forces you to think beyond just who’s better.
What I like about spread betting is that it slows you down. You can’t just say “the Chiefs are better than the Raiders, I’ll take Kansas City.” You have to ask by how much, in what context, on what field, with what injuries. To me, the spread turns a lazy opinion into an actual position.