Caltech's acceptance rate for the Class of 2028 was 2.3%, making it the most selective school in the United States, lower than Harvard, lower than MIT, lower than any Ivy League school. That context matters, because the strategy for getting in has to match the reality of what you are up against. This article breaks down the key things caltech is looking for.
The Actual Numbers
Caltech received approximately 13,000 total applications for the Class of 2028, comparable to the Class of 2027's 13,136 applications. The total number admitted was less than the previous year's 412, making it the smallest admitted class in over 30 years. The target class size is 230 students. IvyWise
Metric | Caltech Class of 2028 |
Applications received | ~13,000 |
Target class size | 230 |
Admitted (Class of 2027 for reference) | 412 |
Students admitted (Class of 2028) | Less than 412, exact figure not released |
Student-faculty ratio | 3:1 |
SAT middle 50% | 1530 to 1580 |
ACT middle 50% | 35 to 36 |
Source: The California Tech, Caltech's student newspaper.
This was also the second year Caltech switched to Restrictive Early Action (REA), and the fourth class since Caltech stopped accepting SAT/ACT scores. Notably, SAT and ACT scores have since been reinstated for the Class of 2029 onwards.
What Caltech Is Actually Looking For
Caltech is transparent about this in a way most schools are not. They want students with a genuine, deep passion for math and science, not breadth of interests, not a long list of clubs, not a resume padded with activities that do not connect to anything.
The most compelling applications come from students who have gone genuinely deep in their pursuits rather than trying to impress with breadth.
That word, depth, comes up constantly in how Caltech describes its ideal applicant. A student who has spent two years working through a single research problem in astrophysics is more interesting to Caltech than a student with perfect scores and twelve extracurriculars that do not connect to each other.
Caltech rejects valedictorians every single day of the admissions cycle. Good grades and test scores are necessary. They are not sufficient. Every applicant Caltech seriously considers already has them.
Why Research Changes the Equation
Research is not a trick for getting into Caltech. It is the most direct way to demonstrate the thing Caltech actually cares about: that you think like a scientist.
Here is what research does to an application in practical terms.
The activities list:
A published paper or a substantive independent research project is a concrete entry, not a vague description of "interest in science." 88% of RISE Scholars included their research in their Common App activities list, according to the RISE Early Admissions Report 2026.
The essays:
Caltech's supplemental essays explicitly ask you to go deep on something you care about intellectually. An essay that can walk through a real research question, the methodology, the dead ends, the result, answers that prompt in a way that a generic essay about loving science cannot. 92% of RISE students referenced their research in at least one written component of their college applications..
The interview:
Caltech does not conduct undergraduate admissions interviews. That means your essays and recommendations carry more weight than at schools where interviews can tip borderline decisions. Research gives both documents more to work with.
14% of RISE Research Students were admitted into CalTech.
RISE Data on Engineering and STEM Admits
RISE Global Education tracks outcomes specifically for students applying to top engineering and STEM schools. According to the RISE Admissions Report 2026, students who completed original research were 3x more likely to receive Top 20 university offers than those who did not.
The report also notes that RISE students applying to Caltech submitted self-driven research projects aligned with their intended major, at a rate substantially higher than the general Caltech applicant pool. Full data at riseglobaleducation.com/results.
For context on what that research looked like: published RISE papers in 2025 appeared in outlets including IEEE, Springer Nature, Journal of Emerging Investigators, and Stanford Intersect. 78% were in STEM or interdisciplinary peer-reviewed journals.
The Research Areas That Align With Caltech
Caltech organizes its undergraduate programs across six divisions. Choosing a research topic that connects to one of these areas makes the link between your application and your intended major explicit.
Caltech Division | Strong Research Areas for Applicants |
Physics, Math, Astronomy | Astrophysics, computational physics, number theory, cosmology |
Engineering and Applied Science | Robotics, integrated electronics, materials science, fluid dynamics |
Chemistry and Chemical Engineering | Biochemistry, polymer chemistry, environmental chemistry |
Biology and Biological Engineering | Synthetic biology, computational biology, bioengineering |
Geological and Planetary Sciences | Climate modeling, seismology, planetary science |
Humanities and Social Sciences | Science policy, behavioral economics, history of science |
The last row matters. Caltech requires all undergraduates to complete a humanities and social sciences core, and they want students who are interested in ideas beyond their primary field. A student whose research bridges STEM and social science is not at a disadvantage.
Competitions That Carry Weight at Caltech
Published research is the strongest signal. But research-adjacent competitions also demonstrate the kind of independent scientific thinking Caltech wants to see.
Regeneron Science Talent Search (STS) is the most prestigious high school science competition in the US. Finalists are named in January and awarded in March.
International Science and Engineering Fair (ISEF) is the world's largest pre-college STEM competition. One RISE Scholar, José R., won ISEF recognition directly from his published research project.
USA Mathematical Olympiad (USAMO) and Physics Olympiad (USAPhO) signal exactly the kind of advanced STEM preparation Caltech looks for. Both require years of consistent preparation.
The Honest Limits of Any Strategy
A few things no strategy can change.
Caltech only enrolls about 1,000 undergraduates total. That is not a rounding error in their admissions numbers, it is a deliberate choice about the kind of institution they want to be. With roughly 235 spots per class, even exceptional research does not guarantee admission.
Caltech explicitly encourages applicants to pursue in depth the STEM topics that genuinely captivate them, and your essays should reveal authentic engagement with scientific or mathematical problems rather than generic expressions of abstract interest in science. Admissions readers at Caltech are themselves researchers. They notice when a student cannot sustain intellectual depth across multiple essays.
Research helps most when it is genuinely yours. A paper published under a mentor's guidance that you can discuss fluently, explain methodologically, and connect to broader questions in the field is a strong application component. A paper you cannot explain clearly in an interview or an essay is a liability.
A Realistic Timeline
Grade | What to Focus On |
Grade 9 to 10 | Build strong math and science fundamentals. Start competitive math preparation early. |
Grade 10 to 11 | Identify a specific research interest. Begin an independent or mentored project. |
Grade 11 | Complete a research project. Aim for publication submission by end of junior year. Enter relevant competitions. |
Grade 12 Term 1 | Use research across all application components. Submit EA if applying. Begin SAT/ACT prep early enough to have scores by October. |
Grade 12 Term 2 | Final RD applications. Follow up on publications and any pending competition results. |
FAQs/ PAA
Q: Does Caltech give any Early Decision advantage?
A: No. Caltech offers Early Action, not binding Early Decision. The acceptance rate advantage is minimal. Apply early to have more time for RD applications elsewhere, not because it significantly improves your odds.
Q: What SAT score do I need?
A: The middle 50% range is 1530 to 1580. Aiming for 1570 or above puts you in the competitive range. Math section performance matters more at Caltech than at most schools.
Q: What if my high school does not offer research opportunities?
A: Online mentorship programs like RISE exist specifically for this reason. The program runs entirely remotely across 40+ countries and pairs students with PhD mentors from institutions like Stanford, MIT, and Oxford. Details at riseglobaleducation.com.
Q: Are there any Caltech-specific programs I should know about?
A: SURF (Summer Undergraduate Research Fellowships) is Caltech's flagship undergraduate research program, open to enrolled students. It is not available to high school applicants, but knowing it exists tells you something important: Caltech builds research into undergraduate life from day one. Students who arrive already knowing how to conduct independent research have a real head start. More at sfp.caltech.edu/undergraduate-research/programs/surf.
Author: Written by Shana Saiesh
Shana Saiesh is a sophomore at Ashoka University pursuing a BA (Hons.) in English Literature with minors in International Relations and Psychology. She works with education-focused initiatives and mentorship-driven programs, contributing to operations, research, and editorial work. Alongside her academics, she is involved in student-facing reports that combine research, strategy, and communication.
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