Replacement Fertility Gap
How far a country sits from the 2.1 replacement level, and what that means for the next cohort.
Replacement fertility is 2.1 children per woman. At 1.4, each generation is about a third smaller than the one before it, and after three generations the cohort is roughly 30% of its original size.
Replacement Fertility Gap
Frequently asked
Is the Replacement Fertility Gap 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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