A key number in NFL betting is a margin of victory that occurs far more frequently than others. These numbers matter because being on the right side of them — rather than the wrong side — dramatically changes your win rate on spread bets.
Why Certain Numbers Are Key
Football scoring is based on fixed increments:
- Field goal: 3 points
- Touchdown + extra point: 7 points
- Touchdown + 2-point conversion: 8 points
- Safety: 2 points
Because most scores are multiples of these units, game margins cluster around specific numbers. The distribution of NFL game margins isn't uniform — certain gaps between scores appear much more frequently.
The Most Important Key Numbers
3 points: The most common NFL margin. Approximately 15-17% of all NFL games are decided by exactly 3 points. A team that "needs" to win by 4+ but wins by 3 is a difference between covering -3.5 and not covering -3.
7 points: Second most common. ~9-10% of games end with exactly 7 points separating teams. The 7-point line is critical for spread and teaser betting.
Other notable margins: 10, 6, 14, and 1 also appear at above-random frequencies.
Practical Applications
Shopping for half-points: If a team is listed at -3 at one book and -3.5 at another, the -3 is dramatically better because you don't lose on a 3-point game.
Buying points: Only buy points in NFL when crossing 3 or 7. Moving from -3.5 to -2.5 (crossing the 3) has real value. Moving from -9 to -8.5 doesn't cross a key number and probably isn't worth the extra cost.
Teasers: The value in NFL teasers comes almost entirely from crossing key numbers with the 6-point adjustment.
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