Cohort Share of School Calculator
How much of a school each birth cohort makes up, and what a falling intake does to the whole roll.
A school with 60 per year group facing an intake falling to 51 loses about 9.5% of its total roll — which is a staffing decision several years before it becomes a class-size one.
Cohort Share of School Calculator
Frequently asked
Is the Cohort Share of School 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.
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