Below are the admit rates based on Capped weighted UC GPA and not major specific, so competitive majors will have lower rates (2017).
Freshman admit rates for UC GPA of 3.80-4.19:
UCB: 12.6%
UCLA: 11.7%
UCSD: 38.7%
UCSB: 53.6%
UCD: 56.5%
UCI: 52.1%
UCSC: 75.7%
UCR: 90.1%
UCM: 96.1%
For comparison purposes, but you want to aim to be at or above the 50th percentile for the best chances.
25th - 75th percentiles for SAT:
UCB: 1280-1490
UCLA: 1280-1500
UCSD: 1250-1470
UCSB: 1210- 1450
UCD: 1190-1430
UCI: 1190-1420
UCSC: 1170-1380
UCR: 1090-1310
UCM: 1020-1230