I think its a size 5
9 aside football pitch size
A Size 3 football is on the smaller side. This is the size of a standard football for team handball.
A college size football is about the same as highschool size football Pro is a size up from college
For under 14 Gaelic Football, you use a full size pitch and goals, with a size 4 football being used...
A football pitch is the field upon which the sport football is played. The regulation size of a pitch is approximately 76,854.3204 square feet.
116 x 76 yards, 8816. http://soccerlens.com/premier-league-pitch-sizes/3683/ is a link to the size of the pitch of prominent football clubs.