* The receiving institution: Each college and university sets its own minimum unit requirements for junior standing. Some may require 60 semester units or 90 quarter units, while others might require more.
* The transferring institution: The number of units the *sending* institution awards for a course can affect the total.
* The student's major: Some majors require more coursework to complete the lower-division requirements. A student transferring into a demanding major like engineering might need more units to be considered a junior than someone transferring into a less demanding major.
To find out the specific requirements:
You should check the transfer credit policies and articulation agreements of the college or university you plan to transfer *to*. Their websites usually have this information in their admissions or transfer student sections. Contacting the admissions office directly is also highly recommended.