It is believed to be 116 yards.
120 yards3650 feet
120 yards (including two 10 yard end zones)
From goal post to goal post, it is 120 yards. The endzones are 10 yards long each, in addition the the 100 yards of the playing field.
120 yards. 100 yards of regulation field, and on each side, 10 yards of an End Zone.
Endzone to endzone it is 100 yard. From goal post to goal post it is 120 yards
120 yards. 100 yards of field and 2 10 yard endzones.
120 yards from goal post to goal post and 50 yards wide.