How many units does an average student need to take become a full time student?

In the United States, a full-time student typically takes 12-15 credit units per semester or quarter. However, this can vary slightly depending on the institution. Some schools may consider 12 credits full-time, while others may require 15 or more. It's always best to check with the specific college or university's registrar's office for their definition of full-time enrollment.