🧬 World Demographic Half-Life

How long until each country's population halves (or doubles) based on current Total Fertility Rate.

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Half-Life / Doubling Time

< 50 yrs (rapid decline)
50-100 yrs (decline)
100-200 yrs (slow decline)
~Stable (TFR ≈ 2.1)
100-200 yrs (slow growth)
50-100 yrs (growth)
< 50 yrs (rapid growth)
No data

Country Details

Hover over a country to see its demographic half-life.

Formula:
Half-Life = ln(0.5) / ln(TFR/2.1) × 27.5

2.1 = replacement rate
27.5 = generation length (years)