From https://www.universityofcalifornia.edu/infocenter/freshman-admissions-summary . Note that these admission rates are not division or major specific; some popular divisions or majors (commonly engineering and CS) are significantly more selective than their campuses overall.
HS GPA is recalculated by the UC method (often resulting in a lower HS GPA than many high schools’ weighted GPA calculations):
http://admission.universityofcalifornia.edu/freshman/requirements/gpa-requirement/index.html (method)
http://admission.universityofcalifornia.edu/counselors/q-and-a/calculating-gpa/index.html (special cases)
https://rogerhub.com/gpa-calculator-uc/ (helpful calculator)
Campus 4.20- 3.80- 3.40- 3.00-
higher 4.19 3.79 3.39
UCB 37% 10% 1% 1%
UCLA 41% 9% 2% 1%
UCSD 70% 34% 7% 1%
UCI 75% 38% 7% 1%
UCSB 80% 41% 8% 1%
UCD 89% 52% 14% 3%
UCSC 92% 70% 33% 12%
UCR 96% 84% 49% 15%
UCM 98% 95% 82% 45%