An American rules football field, depending on the level of play, is 120 yards long (100 for the field of play and 10 for each end zone) by 53 1/3 yards wide. The outer dimensions don’t change for any level of play from Pop Warner all the way to the pros. The principle differences are where the hash marks are placed. In college the hash marks are wider than in the pro game. The hashes are 40 feet apart in College. Each 20 feet from the imaginary centerline of the field.
The rules are that if the ball is downed in on the right side of the field out of bounds or outside the hash marks, as a team advances, the ball will be placed on the line described by the right hash mark.