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What Is a Point Spread? Spread Betting Explained
Last Updated: March 4, 2026
A point spread is a handicap that sportsbooks apply to level the playing field between two unevenly matched teams. The favorite gives points; the underdog receives them. If the Chiefs are -7 against the Broncos, Kansas City must win by more than 7 points for a spread bet on them to pay out. The Broncos, at +7, can lose by up to 6 points and still cover for their backers.
Key Takeaways
- The point spread handicaps the favorite and levels the odds so both sides of the bet pay near -110
- Favorites must win by more than the spread to cover; underdogs cover by losing by less than the spread or winning outright
- If the margin exactly matches the spread, the bet is a push and the stake is refunded
- Half-point spreads (-3.5, -7.5) eliminate pushes and are standard on most markets
- The same probability principles that drive spread pricing power prediction market contracts — the math is identical
How Does Point Spread Betting Work?
A spread bet reframes the question from “who wins?” to “who wins after the handicap?” Both sides of the spread are typically priced near -110, meaning you risk $110 to win $100 regardless of which side you take.
Example — NFL:
- Chiefs -7 (-110)
- Broncos +7 (-110)
If the Chiefs win 28-17 (margin: 11), the Chiefs covered because 11 > 7. If the Chiefs win 24-20 (margin: 4), the Broncos covered because 4 < 7.
Example — NBA:
- Celtics -5.5 (-110)
- Lakers +5.5 (-110)
The half-point ensures no push. The Celtics must win by 6 or more. The Lakers cover if they lose by 5 or fewer, or win outright.
What Does Covering the Spread Look Like Across Different Sports?
The following table shows spread examples across major sports, with outcomes illustrating cover and no-cover scenarios.
| Sport | Matchup | Spread | Final Score | Margin | Result |
|---|---|---|---|---|---|
| NFL | Chiefs vs. Broncos | Chiefs -7 | Chiefs 31-21 | 10 | Chiefs cover (10 > 7) |
| NFL | Chiefs vs. Broncos | Chiefs -7 | Chiefs 24-20 | 4 | Broncos +7 cover (4 < 7) |
| NFL | Chiefs vs. Broncos | Chiefs -7 | Chiefs 28-21 | 7 | Push — bets refunded |
| NBA | Celtics vs. Lakers | Celtics -5.5 | Celtics 112-104 | 8 | Celtics cover (8 > 5.5) |
| NBA | Celtics vs. Lakers | Celtics -5.5 | Celtics 108-105 | 3 | Lakers +5.5 cover (3 < 5.5) |
| MLB | Yankees vs. Orioles | Yankees -1.5 | Yankees 5-3 | 2 | Yankees cover (2 > 1.5) |
| MLB | Yankees vs. Orioles | Yankees -1.5 | Yankees 3-2 | 1 | Orioles +1.5 cover (1 < 1.5) |
| NHL | Oilers vs. Flames | Oilers -1.5 | Oilers 4-2 | 2 | Oilers cover (2 > 1.5) |
In NFL and NBA, spreads range widely — from pick’em (0) to 20+ points in extreme mismatches. In MLB and NHL, the spread (run line / puck line) is almost always fixed at 1.5 because low-scoring games make larger spreads impractical.
Why Does the Spread Use -110 on Both Sides?
The spread itself is the mechanism for balancing action. Instead of adjusting the payout (as a moneyline does), the sportsbook adjusts the point handicap until both sides attract roughly equal money.
Both sides are priced at -110, which means you risk $110 to win $100. The $10 difference is the vig — the book’s margin. Two bettors on opposite sides of a spread collectively wager $220, but the winner collects only $210. The book keeps the remaining $10 regardless of outcome.
The implied probability of -110 is 52.4%. To profit on spread bets long-term, you must win more than 52.4% of the time — which means you need an edge over the market.
How Do Spreads Move Before a Game?
Point spreads are not static. They shift between the opening line and kickoff/tipoff based on multiple factors:
- Sharp action: Professional bettors place large, early wagers. When the book detects sharp money on one side, it adjusts the spread. This is the most reliable driver of movement.
- Injury news: A starting quarterback ruled out can move an NFL spread 3-5 points. Key player absences shift the expected margin.
- Public volume: Recreational bettors tend to favor favorites and overs. Heavy one-sided public action can push a spread even if the fundamentals have not changed.
Tracking line movement reveals where informed money is flowing. A spread that opens at -3 and moves to -5 by game time signals sustained sharp interest on the favorite. A reverse move — opening -5 and closing -3 — suggests sharps are backing the underdog.
Our dataset tracks odds movement across sportsbooks and prediction markets. You can compare how pricing on the same event evolves across platforms on the Odds Reference dashboard.
How Do You Read Spread Odds?
Spread odds follow the same American odds format used across all bet types. A line listed as:
- Patriots -3 (-115)
- Jets +3 (-105)
This means the Patriots must win by 4+ to cover, and you must bet $115 to win $100. The Jets cover if they lose by 2 or fewer (or win), and you bet $105 to win $100. The asymmetric pricing (-115 vs -105 instead of -110/-110) indicates the book has received more action on the Patriots side and is adjusting to balance.
When the vig shifts like this, it is a softer form of line movement. The spread stays at 3 points, but the price signals which side the market favors.
How Does Spread Betting Connect to Prediction Markets?
Point spreads and prediction market contracts price probability differently but answer related questions. A -7 spread priced at -110 implies the sportsbook believes the favorite has a 52.4% chance of winning by more than 7 points. A prediction market contract asking “Will the Chiefs win by 7+?” would trade near $0.50 if it agreed with that assessment.
The difference is in structure. Sportsbooks bundle the probability estimate and the payout mechanism into the spread and vig. Prediction markets express the probability directly as a price. Both require you to evaluate the same underlying question: what is the true probability of this outcome?
The analytical process is the same regardless of venue. Estimate probability, compare to the price being offered, and calculate whether the expected value is positive. If it is, the bet has merit. If it is not, pass. The Odds Reference dashboard provides real-time probability data across sportsbooks and prediction markets, making cross-platform comparison straightforward.
What Are Key Numbers in Spread Betting?
In NFL football, certain margins of victory occur far more frequently than others due to the scoring structure (touchdowns worth 6-7, field goals worth 3). The most important key numbers are:
- 3: The most common NFL margin of victory. Spreads crossing 3 (moving from -2.5 to -3.5) represent significant probability shifts.
- 7: The second most common margin. A touchdown plus extra point.
- 6, 10, 14: Other frequent margins from scoring combinations.
Buying or selling half-points through 3 and 7 is more valuable than through other numbers. Moving from -3 to -2.5 eliminates pushes at the single most common margin — a meaningful probability gain that bettors should factor into their implied probability calculations.
In the NBA, key numbers matter less because scoring increments are smaller (2s and 3s) and final margins are more evenly distributed. MLB and NHL spreads are fixed at 1.5, so the concept does not apply.