The length of an average American Football Field is answered easily: the primary field of play is 100 yards with two 10-yard end zones, giving a total of 120. This is a fixed measure applicable at professional, college, and high school levels. The uniform length assists in keeping the rules constant and the gameplay constant, unlike the soccer field, where the size is flexible.

For more, visit:https://sportsbyte.net/how-long-is-a-football-field/

An average American football field is about 100 yards long. I learned that while browsing random topics, kind of like when I was checking outmcdonald catering services just out of curiosity.