2011 Classroom Size Update — 2025 Edition: Are Classes Still Growing Larger?
When PublicSchoolReview published its 2011 look at classroom size, the question loomed: were classes quietly swelling in size, eroding personalized instruction and straining teacher capacity? Over a decade later, the question remains urgent — but the answer is more nuanced. In 2025, classroom size, policy, and pedagogy all intersect in ways that differ from 2011. This article revisits that structure, updating each section with the latest data, stakeholder voices, and implications for families, educators, and school leaders.
1. National Averages: Mixed Signals, Methodological Challenges
In 2011, many observers pointed to steadily rising student-to-teacher ratios and concerns about “mega-classes.” Today, two factors complicate straightforward comparison: (a) federal reporting has become less complete, and (b) the pandemic disrupted trends.
On the data front, the U.S. Department of Education in 2025 has missed its usual June 1 release of the Condition of Education, delaying or reducing the number of published tables significantly. Brookings This gap makes it harder to track year-over-year changes in average class size.
The most recent reliable estimate comes from the 2020–21 National Teacher and Principal Survey (NTPS), which found that in public schools, self-contained classes averaged about 18.8 students across K–12. National Center for Education Statistics For departmentalized secondary instruction, averages hover in the low 20s, depending on subject and state. That aligns broadly with prior reports: EBSCO’s “Class Size: Research Starters” cites