Class Size Impact Calculator
How much one-to-one teacher attention each child actually gets per lesson and per year.
In a class of 30 with 25 minutes of teacher-led time, each child gets under a minute of individual attention per lesson and about 1.5 hours a year — rising to 2.2 hours if the class were 20.
Class Size Impact Calculator
Frequently asked
Is the Class Size Impact Calculator free?
Yes. Every tool on AlphaBetaMinds is free, needs no account and has no usage limit.
Does this tool store what I type?
No. It runs entirely in your browser. Your inputs are never sent to our server, and nothing is logged.
How accurate is it?
It uses the McCrindle generation boundaries (Gen Alpha 2010–2024, Gen Beta 2025–2039) and UN World Population Prospects vital rates. Sources and formulas are on our methodology page.
Can I use the result in an article or report?
Yes, with a credit and a link back to this page. See our terms of use for the full licence.
More education & learning
Reading Age Checker
Paste any text and see roughly what age it is written for, plus…
School Uniform Cost Calculator
Annual and total uniform cost across a school career, including growth replacements.
Homework Load Calculator
Nightly, weekly and yearly homework hours, benchmarked against the ten-minute rule.
School Systems Compared
Two education systems side by side — starting age, compulsory years, completion and…
Reading Streak Planner
Set a daily reading target and see the books and words it produces…
School Readiness Check
Sixteen readiness signals for starting formal school, weighted by what teachers actually flag.
Graduation Year Calculator
The year a child starts and finishes school from their birth year and…
Report Writing Time Estimator
How long a full set of reports will actually take, before you promise…