Why this matters
NCES pupil:teacher ratio is enrollment ÷ full-time-equivalent teaching staff. It isn't class size — specialists, resource teachers and coaches pull the ratio down without changing what's happening in a classroom — but a lower ratio generally means more adult attention per student.
What we're seeing
At Chicago HS for Agricult Sciences, the student:teacher ratio has risen 17% over the 5-year window — from 13.1:1 in 2021 to 15.3:1 in 2024. The gap vs US average of 15.4:1 has narrowed — from 2.3:1 below in 2021 to 0.1:1 below in 2024.