The standard length of an NFL football field is 100 yards. In addition to the field itself, each end zone extends for another 10 yards, bringing the total length to 120 yards (including both end zones). This standard measurement is crucial for the game, as it defines the playing area where the action takes place. The field's dimensions influence gameplay strategies, player positions, and scoring opportunities. Understanding the field's size is essential for both players and fans to appreciate the dynamics of American football.