To estimate the exterior 2 x 4 wall framing studs correctly:
corners are made up of two studs, requiring one additional stud per corner and drywall clips.
divide the perimeter of the structure by 24 inches to determine the number of studs and add one.
wall intersections are made up of three studs and therefore require an additional two to be added for each intersection.
the stud length is 4 ½ inches less than the room height to accommodate the plate thickness