"Small schools mean closer relationships with professors, big schools mean lecture halls and anonymity" is the conventional wisdom -- and one part of it is genuinely, mechanically true. The rest is more complicated than that, and one major national survey directly challenges the assumption most people build their whole decision around.
The class-size difference is real
At small colleges (under roughly 3,000 students), 60-80% of classes typically have fewer than 20 students, with student-faculty ratios commonly running 8:1 to 12:1. At large universities, it's common to spend your first year or two in introductory lectures of 200-500 students before reaching smaller, more specialized upper-division courses in your major. That part of the stereotype holds up -- the raw numbers genuinely differ this much.
But does smaller actually mean closer to your professors? The evidence says it's not that simple
This is the corrective finding worth knowing before you assume small automatically wins here. The National Survey of Student Engagement (NSSE) -- the largest and most established survey of its kind, drawing on more than 300,000 students across 585+ institutions -- found that a college's enrollment size and selectivity "bear little relationship" to student engagement and faculty interaction quality. Less selective or smaller-profile institutions can and often do offer faculty engagement comparable to more selective, more famous ones. In other words, the size of a school's total enrollment isn't a reliable predictor of whether you'll actually get real access to your professors -- that depends more on specific department culture, advising structure, and how a school is actually run than on its headcount alone.
Class size, retention, and a real complication in the data
Research examining the causal effect of class size specifically (via Stanford's Center for Education Policy Analysis) found that larger classes do increase dropout risk and reduce on-time degree completion -- but, notably, don't meaningfully change eventual, long-run completion. That suggests large intro classes can slow some students down or interrupt their path temporarily, without necessarily preventing them from graduating eventually.
At the same time, a separate, more aggregate pattern complicates the simple "smaller is safer" story further: larger schools have actually shown stronger overall first-year retention over the past decade, with the gap between large and small schools widening -- by 2019, the largest four-year colleges were retaining 82% of their first-year students. These two findings aren't strictly contradictory -- the causal class-size research isolates the effect of class size itself, while the aggregate retention trend reflects everything else that correlates with a school's size, like overall institutional resources. But together they mean "go small to protect your odds of graduating" isn't the clean, universal rule it's often presented as.
There is a real, measurable relationship between resources and outcomes, worth being honest about: schools with student-faculty ratios of 10:1 or better graduate at 60.7%, with median 10-year earnings of $56,811, compared to 41.8% graduation and $41,471 median earnings at schools with ratios worse than 25:1. That's a real gap -- but it likely reflects overall institutional wealth and selectivity as much as class size specifically, since well-resourced schools of any size tend to have both low ratios and strong outcomes together.
The trend actually reshaping this choice right now
This is worth knowing because it changes what "choosing small" might actually mean for you practically. As of fall 2025, large public universities have been growing (roughly 1.4-1.9%) while private colleges overall declined about 1.6% -- and smaller colleges specifically have faced real closures, not just softer enrollment. Sixteen nonprofit colleges announced closures in 2025 alone, including Northland College (Wisconsin), Sterling College (Vermont), and Trinity Christian College (Illinois) -- adding to examples already covered in our piece on whether liberal arts colleges are worth it and our piece on the demographic cliff's uneven impact. Choosing a smaller school right now increasingly comes bundled with a real institutional-stability question, not just a lifestyle preference between lecture halls and seminar tables.
What this means for you
- Don't assume small automatically means closer faculty relationships. Ask a specific school directly about typical class sizes in your intended major and department, and look at their own engagement or advising data if available, rather than inferring it from total enrollment.
- Understand the real, mechanical tradeoff for what it actually is: large schools often mean big lecture classes early on, which the evidence links to more risk of a slower or interrupted path -- but not necessarily a lower eventual chance of graduating. Smaller schools offer more consistently small classes from day one, without that being a guaranteed engagement advantage per the NSSE data.
- If you're considering a smaller, tuition-dependent private school, check its financial stability directly given the current closure wave -- a great fit academically doesn't help if the school can't stay open.
- Think about what you specifically need: consistent small-class engagement across all four years generally favors smaller schools; broader major options, research infrastructure, and resource depth generally favor larger ones. Neither is a universal "better" -- the data doesn't support treating size itself as the deciding factor. Put a large and small option side by side on the actual numbers rather than deciding on size alone.
- Social culture shifts with size too -- Greek life plays a genuinely different role depending on how big the school is, worth factoring in alongside the academic tradeoffs.
- Location compounds with size in a way that's easy to overlook. A small, remote campus and a small urban one produce genuinely different day-to-day experiences despite both being "small" on paper -- weigh setting as its own factor, not just an afterthought to enrollment size.