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Doubling time — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Doubling_time
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-07T12:31:41.241Z
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Doubling time — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Doubling_time (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_bb71ca9824ad (Metraipolis archive dc_bb71ca9824ad, sha256 568ed13c65fdd3a2345b484b350a286831f4201fab86af1bec7b114d110045d1)

BibTeX

@misc{dcbb71ca9824ad,
  title = {Doubling time — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Doubling_time},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_bb71ca9824ad; sha256 568ed13c65fdd3a2345b484b350a286831f4201fab86af1bec7b114d110045d1},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Doubling_time. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

The doubling time is the time it takes for a population to double in size/value. It is applied to population growth, inflation, resource extraction, consumption of goods, compound interest, the volume of malignant tumours, and many other things that tend to grow over time. When the relative growth rate (not the absolute growth rate) is constant, the quantity undergoes exponential growth and has a constant doubling time or period, which can be calculated directly from the growth rate. This time can be calculated by dividing the natural logarithm of 2 by the exponent of growth, or approximated by dividing 70 by the percentage growth rate (more roughly but roundly, dividing 72; see the rule of 72 for details and derivations of this formula). The doubling time is a characteristic unit (a natural unit of scale) for the exponential growth equation, and its converse for exponential decay is the half-life. As an example, Canada's net population growth was 2.7 percent in the year 2022, dividing 72 by 2.7 gives an approximate doubling time of about 27 years. Thus if that growth rate were to remain constant, Canada's population would double from its 2023 figure of about 39 million to about 78 million by 2050.

Tema degli esploratori: scienze della vita e salute (deposito sistematico; categoria «Epidemiology»).
Fonte: Wikipedia in inglese, voce «Doubling time» — https://en.wikipedia.org/wiki/Doubling_time
Wikidata Q1424376 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q1424376
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Doubling_time?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1365310966, consultata il 2026-10-07T12:04:18.561Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: ea3a232ad32f969bbf467ac9ca71047aa7a347075160f07ff6c0f1d19b0c6097