Is Rice or Caltech harder to get into?

Caltech is harder to get into overall. It has a much smaller undergraduate population, a more narrowly STEM-focused applicant pool, and an admissions process that is especially demanding for students aiming at math, physics, engineering, and similar fields.

One big differentiator is scale. Caltech enrolls far fewer undergraduates than Rice, so there are simply fewer seats available. When a school is that small and also globally known for science and engineering, even extremely strong applicants are competing for a very limited number of spots.

Another difference is the academic profile the school is looking for. Rice is highly selective across many areas, but Caltech tends to attract and admit students with unusually advanced quantitative preparation. For applicants interested in STEM, Caltech often expects evidence of exceptional depth, not just strong grades and test scores, but serious rigor in math and science coursework and often notable engagement beyond the classroom.

The applicant pool also works differently. Rice draws a broad mix of applicants across engineering, humanities, social sciences, architecture, and pre-med interests, while Caltech’s pool is more self-selecting and concentrated among students targeting one of the most intense STEM environments in the country. That makes Caltech feel especially difficult because you are competing against a denser group of applicants with similar high-level academic strengths.

So if your question is strictly which one is more selective in the usual admissions sense, the answer is Caltech. Rice is still extremely hard to get into, but Caltech is typically viewed as the more difficult admit.