How does class size at UCLA compare to Williams College for undergraduates?

I’m trying to understand what day-to-day classes would feel like at each school. UCLA is obviously much larger, but I keep hearing that class size can still vary a lot depending on the major and year.

I’m mostly interested in how the typical undergraduate classroom experience compares between UCLA and Williams, especially for intro classes versus upper-level classes.
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Williams and UCLA feel very different in the classroom. At Williams, undergraduates usually get small classes from the start, and the college is known for discussion-based teaching, close faculty contact, and tutorials that can be as small as two students with one professor. At UCLA, the experience is much more mixed: many lower-division courses, especially in popular majors and general education areas, can be quite large, while upper-division classes often become much smaller.

For a student who wants most classes to feel personal right away, Williams is the clearer match. Small seminars are a normal part of the undergraduate experience there, and even introductory courses are often much smaller than what you would see at a large public research university. Professors, not graduate instructors, are central to teaching, so day-to-day class life tends to involve more direct participation and more frequent interaction with faculty.

UCLA fits the student who is comfortable navigating a bigger system and understands that class size depends a lot on department, course level, and major. Intro classes in fields like biology, economics, psychology, math, or chemistry can be lecture-heavy, sometimes with discussion sections led by TAs. That said, once students move into upper-division work, especially in smaller departments or specialized electives, the classroom experience often becomes much more manageable and interactive.

Another practical difference is that at Williams, small class size is part of the institution’s core model, not something you have to seek out strategically. At UCLA, you can absolutely build a more intimate academic experience, but it often comes later or requires choosing smaller programs, honors options, or less crowded departments. So if you are asking what the typical undergraduate classroom feels like day to day, Williams is usually consistently small and discussion-centered, while UCLA is broader, more variable, and often much larger at the intro level.
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