College courses are typically 3 to 4 credit hours per semester. Labs can be 1 to 2 credit hours.
High school classes are normally one-half (0.5) credits per class per semester. A semester of PE or Band might be 0.25 credits.
Estimates are based on 2 to 3 hours of study time plus one hour of class time per college credit.
One high school credit is worth 3 college credits.