Question: what is the standard width of a door jamb?
Answer: Entry door jamb width illustration. Common jamb sizes: 4-9/16”, 5-1/4” or 6-5/8”. (Typical 2x4 is actually 1-3/4" x 3-1/2".) JAMB SIZE = 1/2" interior drywall + wall stud width + exterior sheathing width.