I think every chapter has its own criteria for election to Phi Beta Kappa. At UC Davis, it is as follows:
"An overall UC grade point average of 3.7 for seniors and 3.8 for juniors. For transfer students, the total undergraduate record and cumulative GPA must meet this standard.
Knowledge of a foreign language at an "intermediate level," the equivalent of one year of college-level study. Extensive high school study, i.e., four years, is accepted.
Letters and Sciences units totaling 135 for seniors and 90 for juniors.
Seventy-five units completed for letter-grade credit at Davis.
College preparatory level mathematics.
Breadth in the course record: three courses or twelve units completed for letter-grade credit in the humanities, natural sciences and social sciences. "
You can check out the website, there may be links to your own.
The website is hector.ucdavis.edu/pbk