Calculating UC GPA

I understand the Universities of California calculates GPA using their own methodology. Can you clarify their method?

UC has a specific way to calculate the grade point average (GPA) it requires for admission. Below outlines how to calculate your UC GPA:

1. Convert your grades to grade points.
Convert the grades earned in all “a-g” courses completed between summer after 9th grade through summer after 11th grade to grade points: A=4 points, B=3 points, C=2 points, D=1 points. (Pluses and minuses don't count.)

If you're a California resident and want to know which of your classes count as “a-g” courses, see your high school’s “a-g” course list. If you're not a California resident, refer to the A-G course list site (a database of UC-certified course lists in California schools) and the 15 college-preparatory course categories can provide guidance on the types of courses that have been UC-approved.

2. Give yourself an extra point for each semester of a UC honors-level course, with a maximum of 8 points between 10th and 11th grades. For California residents:

For 10th grade, you cannot use more than 4 honors points.
Grades of D or F in an honors course do not earn an extra point.
Classes taken during the summer after 9th grade count as 10th grade; classes in summer after 10th grade count as 10th grade; classes in summer after 11th grade count as 11th grade.
Honors courses are Advanced Placement courses, International Baccalaureate Higher Level and designated Standard Level courses, UC-transferable college courses and UC-certified honors courses that appear on your school's course list-
https://hs-articulation.ucop.edu/agcourselist#/list/search/institution
3. Add up all the points to find out your total grade points.
4. Divide your total grade points by the number of grades earned in courses taken between the summer after 9th grade though summer after 11th grade.

This is your UC GPA (for example: 3.57). Do not round up or down.

You can find out more about how to calculate the UC GPA at the following link - http://admission.universityofcalifornia.edu/freshman/requirements/gpa-requirement/index.html