Winning margin bets: how likely each band is for an NFL favorite
A spread asks whether a team wins by more than a number. A winning-margin market asks by how much, and pays only if the final margin lands inside the band you chose. One game becomes seven, twelve or more outcomes, and exactly one of them is right.
Where these numbers come from
Every figure below comes from the margin model behind our half-point calculator. It was fit to 6,223 regular-season NFL games from 2002 to 2025, and it turns a game's spread and total into the full range of possible final margins. It doesn't forecast any team; it describes how football scores fall at a given line. All figures use a total of 44.5 and a favorite playing at home, rounded to one decimal.
A field-goal favorite, band by band
For a 3-point home favorite, the model splits the outcomes like this:
- Favorite by 1–6: 22.5%
- Favorite by 7–12: 15.7%
- Favorite by 13–18: 10.6%
- Favorite by 19–24: 6.6%
- Favorite by 25 or more: 4.5%
- Tie: 0.3%
- Underdog by 1–6: 19.1%
- Underdog by 7–12: 10.0%
- Underdog by 13 or more: 10.7%
The favorite wins 60.0% of the time, yet no single band reaches a quarter of the outcomes. The smallest margin is the likeliest band: 1–6 leads for a home favorite of 3, 7 or even 10 points (19.2% against 17.3% for 7–12 at 10). It holds the field goal, and 9.1% of games at this line end on exactly 3.
A touchdown favorite
For a 7-point home favorite the weight shifts toward the bigger bands without the order changing: 21.5% for 1–6, 17.3% for 7–12, 14.2% for 13–18, 10.3% for 19–24 and 8.5% for 25 or more. The underdog still wins 28.0% of the time.
On the road the same favorite's bands move by up to about a point and a half, because the model carries home-field scoring patterns, but the order stays the same.
Big win, little win
The four-way version splits each team's win at 12 and 13 points. For a 7-point home favorite the model has a little win (1–12) at 38.8%, a big win (13 or more) at 33.0%, an underdog little win at 22.1% and an underdog big win at 6.0%. The last 0.2% is a tie, which some books void and others price as a fifth outcome.
A big-win ticket isn't a spread bet. If the favorite lays 7 and wins by 10, the spread bet wins and the big-win ticket loses.
Reading a band's price
Convert each band's price to an implied probability and set it beside a figure like the ones above: +300 implies 25.0%, +400 implies 20.0%. Then add up every band's implied probability on the market. A margin-free market would total exactly 100%; whatever sits above 100 is the book's margin. The comparison is yours to make. Nothing here is a pick.
Bankroll Guardian is a bet-tracking and analytics tool — not a sportsbook, and none of this is betting advice. Betting carries risk; please bet responsibly.