The length of a standard football field is 100 yards between the goal lines, with an additional 10 yards for each end zone, making the total length 120 yards. The field is 53.3 yards wide, marked with lines every 5 yards to assist in gameplay. This standardized dimension is essential for organized play, ensuring that all teams compete on the same sized field. Additionally, the field's markings assist players, officials, and fans in understanding the game's progress.