California Institute of Technology

caltech.md

California Institute of Technology

Admissions (Class of 2029 / Fall 2025)

• Total applicants: 16,626
• Overall acceptance rate: 2.6%
• Early round: Early Action (non-binding, non-restrictive) — 6.0% vs 1.8% RD
• Class size: 235
• Yield: 43%

Academics

• SAT middle 50%: 1530–1570
• ACT middle 50%: 35–36
• Avg unweighted GPA: 3.97
• Top 10% of HS class: 99%
• Testing policy: Test-free (SAT/ACT not considered)

Demographics

• Women: 30.7%, Asian: 26.3%, Black: 1.2%, Hispanic: 7.8%, White: 33.6%, International: 27.3%

Financial Aid / Net Cost

Athletics

NCAA Division III — no athletic scholarships. Tiny program given class size (235).

Notable

Lowest acceptance rate in the US (2.6%). Test-free — SAT/ACT not considered at all. No legacy preference. Yield low (43%) — many admits choose MIT or Harvard.

Community Insights (Reddit/Forums)

Admissions Strategy

• EA (non-binding, non-restrictive) acceptance rate ~6.0% vs ~1.8% RD — early advantage exists but both rates are extremely low
• No legacy preference — Caltech has never considered legacy status, confirmed across multiple forums and institutional statements
• No development/donor hook — Caltech is considered, alongside MIT, the most purely meritocratic of elite schools
• Testing policy recently changed: Caltech was test-free through 2024 but reinstated test requirements for Fall 2025 applicants — this is a significant shift widely discussed on forums
• Forum consensus: Caltech wants deep STEM passion and research experience; breadth and well-roundedness matter much less than at Ivies
• Tiny class size (235) means each admissions decision is high-stakes — forums describe it as essentially hand-picked

Campus Culture & Fit

• Intensely academic, small community — 235 per class creates an intimate environment
• Honor Code culture is strong — take-home exams, unproctored tests, and collaborative problem-solving are norms
• "Pass/fail" first two terms reduce initial pressure — similar to MIT's pass/no-record system
• Pranking tradition (especially with MIT and Harvey Mudd) is part of campus lore
• Forums describe social life as limited due to tiny size and Pasadena location — "it's a research institute, not a university" is a common framing
• Gender imbalance (only 30.7% women) is noted on forums as a cultural factor

Financial Aid Reputation

• Need-blind for domestic applicants; need-aware for international
• Net costs are moderate — $4.8K for families under $30K, $40.8K for families over $110K
• No athletic scholarships (D-III), no merit scholarships — all aid is need-based
• Forum consensus: aid is good but the tiny student body means less overall aid budget

Simulation-Relevant Takeaways

• No legacy/donor/athlete hooks — all multipliers should be ~1.0x (same as MIT)
• 43% yield is very low — many Caltech admits choose MIT or Harvard instead; yield model needs to reflect this
• Tiny class (235) means the simulation may need special handling — a single admit/reject decision has outsized impact on composition
• EA is non-restrictive, meaning Caltech competes for admits who also applied early elsewhere
• Return to test requirements may shift the applicant pool starting 2025

Sources

• California Institute of Technology Common Data Set 2024–2025
• research_colleges.json simulation data
• Inside Higher Ed: "Harvard, Caltech return to test requirements" (2024)
• College Confidential: California legacy admissions ban thread
• CollegeTransitions: "How to Get Into Caltech"