The dimensions of a typical twin box spring are 39 inches in width and 75 inches in length. The height of the standard box spring ranges between 5 and 9 inches.
As compared to the standard twin box spring, an extra-long one measures 39 inches in width and 80 inches in length. The standard twin box spring is preferable for children, short people and small rooms. The extra-long twin box springs are normally used in the dormitories of educational institutions.
A box spring with a shorter height is better for children and short people. On the other hand, box springs that are taller are more suitable for individuals with longer legs.