The dimensions of a football field will vary slightly based on the level of play (high school, college, pro).
PRO TIP: You may have heard before that a football field is 100 yards long. This is incorrect. A regulation football field is 120 yards in length. The reason people get confused is because the field of play is 100 yards long. The end zones are 10 yards long making the total length of a football field 120 yards.