How to Get into the California Institute of Technology (Caltech)

Since its establishment in 1891 by philanthropist Amos Throop and astronomer George Ellery Hale, the California Institute of Technology has gone through several name changes through the years. Initially, the school was known as Throop University. From there, it switched names to Throop Polytechnic Institute and then on to Throop College of Technology before receiving its present name — and shorthand “CalTech” — in 1920.

CalTech attracts students from around the world thanks to its reputation as a renowned STEM institution. Students in the local area can get a head start with our Pasadena college counseling team, who understand exactly what it takes to build a competitive application for this highly selective school. Such prestige makes the school an undeniably coveted choice for aspiring math, science, and engineering students, but it also makes it an extremely difficult institution to be accepted into.

There are several dozen notable individuals with deep ties to CalTech. Albert Einstein, for instance, was a visiting professor at CalTech for three terms. He lived in a tiny apartment on South Oakland Avenue for one term and in CalTech’s faculty club for the other two.

While Einstein taught at CalTech for a limited time, there have been many additional noteworthy faculty members and distinguished alumni of the school, including:

• Frank Capra, Academy Award-winning film director
• William A. Fowler, Nobel Prize winner in physics
• David Baltimore, Nobel Prize winner in medicine
• Paul MacCready, the “father of human-powered flight”
• Gerald J. Wasserburg, Crafoord Prize in Geosciences winner

If you hope to follow in their footsteps, you have to know how to get accepted into CalTech and what the school is looking for in prospective students.

You will need to put your very best efforts forward throughout your studies in high school as well as in your extracurricular activities. Your application must be submitted with clear, well-written essay answers, and your GPA, test scores, and transcripts must be nothing short of impeccable as well. 

While it’s extremely difficult to gain entry to this esteemed school, you can significantly improve your chances by taking advantage of all the CalTech application help you can get. You may want to start by discovering what the most recent incoming class profile looks like to compare what you offer compared to those already accepted by CalTech.

Though the school states that there is no single prescribed path to take when it comes to being accepted into CalTech, the most valuable thing you need to know is that it searches for students with exceptional talent, ability, and potential in STEM. With that being said, however, the institution states that you should have a passion for something outside of STEM, not just STEM alone. 

Beyond that, one of the very first pieces of CalTech admission help the school itself offers is to ensure the rigor of your high school classes is as intense as you can handle. 

CalTech wants its successful applicants to join their current student body on campus, which is more than ready to tackle complex issues and actually enjoys tackling them. So to be ready for CalTech, you must be curious, intellectually driven, and want to be surrounded by and learn from other like-minded students. 

The school also states that while the admissions staff does not expect you to be a master of proof-based math upon entry, they do expect you to be able to prove your proficiency in calculus. They also favor applicants with a proven love for science: individuals who have already taken advanced physics and chemistry and flourished with them. 

They also know that many students have done a great deal with math and science outside of the classroom, so the admissions committee takes that kind of work into consideration as well. There is no solid GPA cutoff, and CalTech doesn’t require you to participate in a specific number of extracurriculars. 

You aren’t expected to be a research fan, guru, or professional researcher, either, as that will come during your time at CalTech, but the admissions staff is very clear about following a holistic approach to admissions, which means that they consider an enormous variety of factors to decide which students ultimately receive invitations and which do not. 

As such, the staff’s consideration involves far more than just your SAT and ACT scores, GPA, class rank, and extracurricular activities. They also regard where you live, what resources you’ve had available to you (or didn’t) during high school, and what your responsibilities to your family, peers, and community look like.

CalTech states as such right on their website: There are many students who are qualified to attend the school but are just not invited to do so because there are far more qualified applicants every year than there are spaces to place them. 

In fact, the school states that it accepts fewer than 5% of its applicants and that every incoming class only has about 235 open spaces. For the class of 2026, for instance, CalTech only had room for 3.3% of its applicants, down from 3.92% for the previous term. In other words, the school received 13,026 applications for admission and only accepted 432 of them. Matriculation (students who actually enrolled) was 275 instead of 235, meaning they were overbooked by 40 students.

CalTech wants you to be used to being challenged and pushed to think in new, innovative ways. You must demonstrate this quality by taking a strong set of courses in high school, which should include:

• At least one year of U.S. government or history
• Three or four years of English
• At least one year of physics (calculus-based preferred)
• At least one year of chemistry 
• Four years of math Definitely one year of calculus

CalTech wants to see proof that you are willing and able to explore, which means having taken courses that forced you to think differently. The admissions faculty explains that while that requirement doesn’t necessarily mean that you have to take every AP course available, they want to see you have risen to challenges throughout your academic career.

If you cannot take any AP or IB courses in high school (if they are not offered, for instance), you will be expected to explain to CalTech the reason for that gap in your application. They explain that they respect students’ choices but want to know the reasons why that decision was made.

There is an area on the CalTech application where you will have space to explain anything you want about your academic career, so it would be ideal for putting your reasons for the lack of AP courses there.

Math underlies just about everything at CalTech, which is why they want to see that you have taken and done well in calculus and related courses. The admissions faculty seeks students who are successful with rigorous, abstract math, which means that, as part of your high school studies in calculus, you should gain experience with the following:

• Linear algebra
• Set theory and logic
• Integral and differential calculus
• Ordinary differential equations

The expectations for science are just as stringent, as the faculty is looking for students who have taken chemistry and physics at their most advanced levels, as offered by their applicants’ high schools.

Of CalTech’s class of 2026, 96% of them earned a spot among the top 10% of their graduating high school classes. The school does not divulge any information on the average GPAs of the students who are accepted, but it’s pretty safe to say that almost all of them carry an unweighted GPA of around 4.0, with a full roster of AP and IB courses under their metaphorical belts.

When it comes to SAT and ACT scores, CalTech has been operating with a test-blind policy as of late, which means that it does not consider test scores in its admissions-decision processes. The test-blind policy will continue through the class of 2027 admission cycle.

However, for the class of 2024 — currently the last class to have had high test scores required — 50% of its student body scored between 1510 and 1570 on the SAT. In addition, 50% of students who took the ACT and were admitted to CalTech in the class of 2024 scored either a 35 or 36 on the test.

The school cites five factors as being “very important” in the admissions decision-making process:

• Application essay answers
• Your character/personal qualities
• Letters of recommendation
• The rigor of your high school classes
• Standardized test scores (should testing be required)

The "important" factors include GPA, class rank, and extracurricular activity involvement. 

The California Institute of Technology does not take demonstrated interest into consideration, so you will not be given bonus points if you have engaged with the university on a personal level. At the same time, you will not be penalized if you haven’t engaged as such. 

Demonstrated interest includes activities such as visiting the campus, connecting with alumni, taking part in virtual tours and Q&A sessions about admissions, and other similar activities.

While some institutions of higher learning require admission interviews, others have made them optional, with some no longer providing this opportunity at all. Some schools have substituted the interview process with an optional “video introduction” opportunity, but not all schools have taken this approach.

No undergraduate interviews are required (or available) for CalTech. Colleges that mandate interviews rely on them to judge applicants, and since CalTech does not, its applicants are best represented through their teachers’ letters of recommendation and their answers to the application’s essay questions.

With so much riding on the answers you provide for the application’s essays, it’s critical that you devote a heavy amount of time and effort to them. One of the best ways to get started with them is to review some of the prompts used in the most recent application cycle. 

They are as follows:

• In no more than 150 words, discuss a time when you encountered failure
• Discuss something outside of the classroom that has inspired you (150-word limit)
• Describe how you have worked with peers on a task and how that will help you at CalTech in no more than 150 words

Regardless of what essay prompts you will need to answer, ensure that you use these opportunities to tell CalTech genuine things about yourself. Don’t repeat information that is already stated elsewhere on your application or boast about your past courses or even your extracurricular activities, either. 

During admission cycles, when they are not considering SAT and ACT scores, not offering interviews, and not considering demonstrated interest, your essays are the primary way CalTech will learn about you personally. They want to know more about you as a person. 

As such, always obey CalTech’s highest rule: Be yourself. Make your responses honest, heartfelt, and entirely your own. You must successfully communicate your passions for math, science, engineering, and technology in convincing and illuminating ways.

CalTech isn’t all numbers, either, which often comes as a surprise to many people! The prestigious school has unique traditions that cultivate a sense of true community among its students. Take the opportunity to read through CalTech’s website and get a feel for the demeanor of the school that it represents. 

For instance, their application includes a prank prompt to give you an opportunity to engage in some essay writing that is more lighthearted and fun. Speaking of pranks, one house fires a cannon many times throughout the year, while another drops a liquid nitrogen-filled pumpkin from the top of CalTech Hall. 

Some of the most notorious pranks by CalTech are decades old and still talked about today. For instance, in 1961, the University of Washington’s card stunts for the Rose Bowl Parade were changed to read “CalTech.” In 2005, CalTech successfully handed out hundreds of prank t-shirts at MIT’s preview weekend, and in 1987, students even managed to change the “Hollywood” sign to read “CalTech!”

Your responses to the application and its essays, both serious and humorous, will help CalTech’s admissions officers share your excitement and enthusiasm for whatever you choose to focus on as your subject. It’s that enthusiasm that the school is searching for amongst thousands of applicants every year, and it just might be what is able to single you out from others vying for a spot in the next incoming CalTech class.