When a whole-number line lands exactly on the number, the bet is a push and your stake comes back. It is not a win and it is not a loss, and pricing it as a loss makes every number wrong.
Take a team at minus 7. The game can end with them winning by exactly 7, which returns your stake. That happens about 3% of the time on a whole number.
If you ignore the push and treat it as a loss, you price that bet too cheaply. Priced properly, on win divided by win plus lose, a minus 7 line comes out at 2.73 rather than the 2.82 you would get by ignoring it.
On a whole-number line the push chance is real and measurable, and any fair price has to include it.
About 3% of the time on a whole-number NFL line, though it varies by the number. Common margins like 3 and 7 push more often than others.
Take a half-point line. A line ending in .5 cannot land exactly, so there is no push. You are usually paying a slightly worse price for that certainty.
Learn the method
NFL and NFL team names are trademarks of their respective owners. SportHoot is not affiliated with, endorsed by, or sponsored by the NFL or any NFL team. Probabilities are model estimates of what may happen, and SportHoot does not accept bets. 18+.