http://talk.collegeconfidential.com/university-california-general/2127392-faq-uc-historical-frosh-admit-rates-by-hs-gpa-2018.html has some information about 2018 UC admit rates by GPA, but you need to recalculate your GPA by the UC method (use the weighted-capped version to compare to that table) – links to calculator and information on GPA recalculation in that post.