text: why is the size of a football pitch as it is when and how was it determined?   not all pitches are the same size.  a football pitch (let's not call it soccer) must be between 100 yards (90m) and 130 yards (120m) and width not less than 50 yards (45m) and not more than 100 yards (90m).   for international matches the length of a pitch must be between 110 yards (100m) and 120 yards (110m) and width not less than 70 yards (64m) and not more than 80 yards (75m).   as for how this was determined, you will probably find that over the years this has averaged out until someone at fifa set the above dimensions.  there are set dimensions for everything from the size of the goal posts to the markings on the pitch.