Contact the registrar's office or flip through your college handbook to see how semester hours are counted. Many times the number of hours you are in class in a week for a given class is the amount of hours or credits you'll receive. For instance, say you are taking a chemistry class for three hours per week. That would count as three college hours for that semester.
Multiply each class by how the college or university calculates hours. For instance if you take three hours of English, two hours of biology, two hours of calculus, one hour of physical education and one hour of history and each class hour was worth one college credit hour the math would be the following:
English 3 x 1 = 3
Biology 2 x 1 = 2
Calculus 2 x 1 = 2
Phys. Ed. 1 x 1 = 1
History 1 x 1 = 1
Add the number of college hours together to get the semester total. Using the example above, the semester total would equal nine semester college hour credits.