The short answer
A spread is a number set by a sportsbook to handicap a game. The favorite gives points, and the underdog gets points. Your bet wins if the team you picked beats that adjusted score.
If Kansas City is -3.5, they need to win by 4 or more points for a spread bet on Kansas City to win. If the opponent is +3.5, that opponent can win outright or lose by 3 or fewer points and still cover.
How to read the plus and minus signs
| Line | Meaning | What must happen |
|---|---|---|
| Favorite -3.5 | The favorite gives 3.5 points | Favorite must win by 4+ |
| Underdog +3.5 | The underdog receives 3.5 points | Underdog wins or loses by 3 or fewer |
| Favorite -7 | The favorite gives 7 points | Favorite must win by more than 7 |
| Underdog +7 | The underdog receives 7 points | Underdog wins, loses by 6 or fewer, or pushes at exactly 7 |
What does cover the spread mean?
Covering the spread means your pick wins after the handicap is applied. It does not always mean the team won the game. An underdog can lose the real game and still cover if it stays inside the spread.
Half-point spreads like -2.5 or +6.5 cannot push because no team can win by half a point. Whole-number spreads like -3 or +7 can push when the final margin lands exactly on the number.
Why spreads move
- Injury news can change the expected margin.
- Weather can lower scoring expectations and affect favorites differently.
- Market pressure can move a number if many bettors take the same side.
- Limits rise closer to game time, which can make later moves more meaningful.
Beginner rule of thumb
Do not treat a small spread as a prediction that the game will be close or a large spread as proof that the favorite is safe. A spread is a market price. The useful question is whether the number you are betting is better or worse than the realistic range of outcomes.
Bet only where legal, keep stake sizes affordable, and avoid chasing a spread because one play changed your opinion.