Vanguard University defines enrollment status below for current students based on a 16-week semester (see Academic Calendar for more detail): 

Full-time:
Undergraduate¹:  12 units
Graduate²:  6 units

Three-Quarter-time:
Undergraduate:  9 units

Half-time:  
Undergraduate:  6 units
Graduate:  3-5 units

¹

This is the minimum number of units a student must complete to be considered full-time status. However, note that students must generally take an average of fifteen (15) units in fall and spring semesters to complete a 120 unit bachelor's degree in four years, assuming all units taken apply to degree requirements. Students should carefully plan their courses with their Student Success Coordinator (academic advisor) to ensure timely progress toward degree. 

²

This is the minimum number of units a graduate student must complete to be considered full-time status. Expected time to degree, which includes required summer terms form some programs and not for others, should be carefully planned with the student's graduate coordinator. In most cases, students will need to take more than the minimum required for full-time status to complete a graduate program in the expected two-three years.