2026–27 application cycle · via common_app
California Institute of Technology supplemental essays
Every writing prompt on the California Institute of Technology application, with word limits, taken from the application itself. 9 prompts.
- Prompt 1Required200 words max
STEM Academic Interest
If you had to choose an area of interest or two today, what would you choose? Why did you choose your proposed area of interest? If you selected 'other', what topics are you interested in pursuing?
How to approach it
An academic-interest prompt wants the origin story and the evidence, not the resume. Pick the moment the interest became yours, show one or two things you did about it on your own, and let the school see how you think when nobody assigns the work.
- Prompt 2Required200 words max
Your area of interest
Why did you choose your proposed area of interest? If you selected 'other', what topics are you interested in pursuing?
- Prompt 3Required200 words max
Learning through collaboration
Tell us about a time your learning in STEM was shaped by another person or group — either because you needed help, offered help, changed your thinking through collaboration, or contributed to someone else's understanding. What did that experience teach you about learning and working with others?
- Prompt 4Required200 words max
Process over outcome
Tell us about a time your approach to a STEM problem, concept, or project mattered as much as the outcome. How did you work through uncertainty or persist creatively in tackling the problem? What would you still defend about your process, regardless of the outcome?
- Prompt 5Required200 words max
Your STEM rabbit hole
Regardless of your STEM interest listed above, take this opportunity to nerd out and talk to us about whatever STEM rabbit hole you have found yourself falling into. Be as specific or broad as you would like.
- Prompt 6Required200 words max
What held your attention
Tell us about a STEM question, problem, idea, or project that has held your attention over time. What drew you to it, how have you pursued it, and what do you still want to understand?
- Prompt 7Required200 words max
Something you made
Tell us about something you created, tested, repaired, modeled, coded, built, or redesigned. What problem were you trying to solve and what did the process reveal to you?
- Prompt 8Required150 words max
Your contribution to Caltech
Caltech students bring more than academic ability to the communities they join. What is something you would be excited to do, share, teach, make, start, or contribute as part of the Caltech community?
How to approach it
Community and identity prompts reward specificity over significance. A small, true community described from the inside beats a broad label described from the outside. End on what you carry from it into a campus, not on a moral.
- Prompt 9Optional
Your academic context
Caltech cares about context. Is there anything about your academic preparation, coursework, school context, or learning experiences that would help us better understand your readiness for Caltech?
How to approach it
The additional-information space is for context, not a bonus essay. Use it if something needs explaining (a grade dip, a circumstance, a commitment that limited activities), state it plainly in a few sentences, and leave it empty otherwise. Empty reads better than padding.
Common questions
California Institute of Technology essays, answered
How many essays does California Institute of Technology require?
California Institute of Technology lists 9 writing supplements for the 2026–27 cycle, of which 8 are required. That is on top of the main personal statement.
How long are the California Institute of Technology supplemental essays?
Word limits across the listed prompts add up to roughly 1,550 words. Budget real time for them: supplements are where admissions sees your specific interest in California Institute of Technology.
Do the California Institute of Technology supplemental essays matter?
Yes, and more as selectivity rises. Grades and scores put you in the pool; supplements are one of the few places you control what the reader learns about you, and a generic why-us essay is one of the most common self-inflicted wounds in admissions.
What Spike does with this
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