What Is a Point Spread? Definition, Examples & Cover Odds

A point spread is a handicap sportsbooks apply to level a mismatched game. The favorite must win by more than the spread to cover; the underdog covers by losing within the margin or winning outright. A Chiefs -7 line against the Broncos means Kansas City needs a win by 8 or more points, while Denver covers on anything closer.

Last verified July 19, 2026.

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
• Converting a spread’s -110 price to implied probability, or checking the vig on either side, takes seconds with the odds converter and vig calculator
• 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?” The sportsbook sets a margin the favorite must clear, and bettors pick either side of that margin instead of the game’s straight-up winner. Both sides are typically priced near -110, meaning you risk $110 to win $100 regardless of which team 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?

Covering the spread looks different by sport because scoring scale changes the size of a typical line: NFL and NBA spreads range from single digits to 20+ points, while MLB and NHL spreads are fixed near 1.5 runs or goals. The table below shows real cover, no-cover, and push outcomes across four major sports.

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 balances action through the point handicap rather than the payout. Instead of adjusting odds like a moneyline does, the sportsbook shifts the number of points until both sides attract roughly equal money, then charges the same -110 price on each side to lock in its margin regardless of which team covers.

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. Odds Reference’s analysis of 149,000+ historical NFL, NBA, MLB, NHL, NCAAF, and NCAAB games (2007-2022) found mainline spreads at sharp books like Pinnacle average roughly 2.5-3% vig, versus 4.5-5.5% at mainstream retail books like BetMGM and Caesars — see the full vig-by-bet-type breakdown. Plug any two-sided line into the vig calculator to see the exact hold percentage and the no-vig probability on each side. For industry-wide context on how sportsbook hold has trended, the American Gaming Association’s research page publishes handle and hold data by state.

How Do Spreads Move Before a Game?

Point spreads are not static — they shift between the opening line and kickoff or tipoff as sportsbooks absorb new information and betting volume. Sharp action, injury news, and lopsided public volume are the three main forces, and tracking how far and how fast a line moves can reveal which side professional bettors favor.

• 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 every bet type: a negative price shows what you must risk to win $100, and a positive price shows what a $100 bet would profit. Reading a two-sided spread line means checking both the point handicap and the price attached to each side, since the two can move independently.

• 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. To convert -115 or -105 into decimal odds or implied probability without doing the arithmetic by hand, use the odds converter.

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 often than others because touchdowns are worth 6-7 points and field goals are worth 3. Bettors call these clusters “key numbers,” and a spread crossing one represents a much larger shift in cover probability than a move between two non-key numbers. 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 a significant probability shift.
• 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.

Spread betting is a form of gambling, and the -110 vig means the long-run edge starts with the sportsbook, not the bettor. Set a budget before betting and use tools like the Odds Reference responsible gambling toolkit or the National Council on Problem Gambling if betting stops feeling like entertainment.