How does Caltech evaluate international students in the admissions process?

Caltech reviews international applicants using the same overall holistic process it uses for domestic applicants, but the academic bar is especially high because the applicant pool is so strong and Caltech is very focused on preparation for intense math and science coursework.

For an international student, the biggest factors are usually your transcript, the rigor of your courses, and clear evidence that you are operating at a very advanced level in math and science. They will look closely at what was available in your school system and whether you pursued the most challenging path. Strong grades matter a lot, but so does the level of the classes.

They also pay attention to teacher recommendations, especially from math or science teachers who can speak to how you think, solve problems, and engage with difficult material. Caltech tends to care less about polished self-presentation and more about intellectual depth, curiosity, creativity, and genuine fit for a highly technical, collaborative environment.

Your extracurriculars do not need to be long lists of leadership titles. What helps more is meaningful evidence of scientific or mathematical engagement, such as Olympiads, research, advanced projects, programming, engineering work, or other serious academic pursuits. National or international distinction can help, but it is not required.

If you submit test scores, high scores can support your application, especially in a context where grading scales differ internationally. English proficiency may also matter if it is relevant to your schooling background.