California Institute of Technology is a magnet for young scientists. It is a world-renowned science and engineering institute and a strong option for STEM students who want to develop as competent professionals. Though Caltech is often compared with MIT for its strength in science and engineering, Caltech is much smaller. According to Caltech’s registrar, the Institute enrolled 971 undergraduates in fall 2025-26.
Caltech is highly selective. Its latest official Class of 2029 profile listed 11,287 first-year applicants and 248 enrolled first-years. Caltech also announced that it offered admission to 428 students for the incoming Class of 2030. We have covered the relevant information that can help students understand the application process, from completing the application form to preparing a competitive admissions file. Continue reading if you want to use this information.
Admissions Process at California Institute of Technology
Though the California Institute of Technology is one of the most selective institutions in the US, students can still strengthen their applications by preparing carefully and meeting all current requirements.
There are several steps that students need to follow when applying for admission. The details are given below.
Step 1. Fill Out the Application Form
The first step to apply for admission at Caltech is to fill out the application form. Caltech currently lists two application options for first-year applicants: the Common App and the QuestBridge Application. Caltech states that it does not have a preference between these two applications.
Caltech is also a QuestBridge partner, and eligible students may apply through the QuestBridge National College Match. Students need to provide basic information about themselves, their family background, academic history, and other required details in the application form.
Step 2. Submit Essays
The next step is to submit the Caltech-specific questions. These questions change annually and are usually published in the summer. The essays give applicants an opportunity to explain their STEM interests, experiences, creativity, and personal background in their own voice.
Applicants should show genuine curiosity, eagerness to learn, and specific examples of their interests and experiences. Strong essays can help the admissions committee better understand the applicant beyond grades and test scores.
Step 3. Pay the Application Fee
Caltech requires a one-time, non-refundable application fee of $75. However, students who are applying for financial aid and for whom the fee presents a hardship may request a fee waiver. Caltech states that no additional documentation is required for eligible applicants who request this waiver.
Students applying through QuestBridge are not charged Caltech’s standard application fee.
Step 4. Take Standardized Tests
Caltech has restored its standardized testing requirement. First-year applicants must submit either SAT or ACT scores. For fall 2026 applicants, Caltech does not require the ACT writing or science subscores and states that standardized test scores are used as one factor in its holistic review process.
International applicants must submit English proficiency exam scores unless their native language is English or English is the primary language of instruction in their secondary school. Caltech accepts the Duolingo English Test, IELTS, or TOEFL for this requirement.
Step 5. Need for SAT/ACT
The SAT/ACT testing moratorium has ended. Caltech requires first-year applicants to submit either the SAT or ACT. Applicants should review Caltech’s current testing deadlines for their application round and make sure scores are submitted on time.
Step 6. Prepare Teacher Recommendations
Students need to submit two teacher or instructor recommendations from the last two years of high school: one from a STEM subject, such as math, physics, chemistry, or biology, and one from a humanities or social sciences subject, such as English, history, government, or economics.
International applicants who have not taken a humanities or social sciences course in their final two years of secondary school may substitute another recommendation from a teacher in a different STEM subject.
Tips to Get into California Institute of Technology
Here are three tips that can help interested candidates prepare a stronger application to the California Institute of Technology.
Tip 1. Standardized Tests
Caltech is no longer test-blind. Students should plan to submit either SAT or ACT scores and should prepare for standardized testing alongside the rest of their application materials.
Tip 2. Prepare for Essays and Teacher Recommendations
Interested students should spend time writing thoughtful essays that genuinely represent their interests, experiences, and motivation. Teacher recommendations are also important because they help the admissions committee understand an applicant’s academic strengths, classroom performance, curiosity, and character. Students should ask teachers who know them well and can speak in detail about their work.
Tip 3. Obtain a Strong Math and Science Background
As Caltech is a STEM-focused institution, a strong math and science background is essential. Caltech expects first-year applicants to demonstrate mastery in four years of math, including one year of calculus, one year of physics, and one year of chemistry. Biology is recommended. Students can also strengthen their application by taking challenging courses and participating in extracurricular activities that show curiosity, initiative, and depth in STEM.
FAQs about Studying at Caltech
What is the Acceptance Rate of the California Institute of Technology?
California Institute of Technology has an acceptance rate of under 5% for both Restrictive Early Action and Regular Decision, according to Caltech’s current admissions guidance. The exact admit rate changes by year. Caltech’s latest official Class of 2029 profile listed 11,287 first-year applicants and 248 enrolled first-years, while Caltech announced that it offered admission to 428 students for the incoming Class of 2030.
The acceptance rate of a specific institution tells students how selective the admission process is. It can also show how many students are competing for a limited number of places.
Although acceptance rate is not a definitive indicator of institutional quality, it can help students understand how competitive admission may be. Students should also check eligibility criteria, academic requirements, testing requirements, essays, recommendation requirements, and financial aid policies before applying.
Caltech is a strong magnet for students who want to study STEM subjects. Though often compared with MIT, the California Institute of Technology has a much smaller undergraduate population. Students who follow the current application requirements and prepare carefully can give themselves the best chance of submitting a competitive application to Caltech.
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