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Population projection compounds the natural growth rate — births less deaths — and then adds net migration each year. Doubling time follows from the growth rate alone and is a useful sanity check: 1% growth doubles a population in about 70 years.
Geometric growth
Population = Current x (1 + Growth rate)^Years, plus net migration each year
Doubling time
Doubling years = ln(2) / ln(1 + Growth rate)
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.
Because it compounds. The difference between 0.5% and 1.5% growth over 50 years is roughly a 60% difference in final population.
No. Fertility declines with development, so cohort-component projections with age-specific rates are used for serious demographic work.