Population Calculation Terms

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Last updated 2:25 PM on 9/8/26
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7 Terms

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Crude Birth Rate (CBR)

number of live births per year for each 1,000 people

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Crude Death Rate (CDR)

number of deaths per year for each 1,000 people


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Doubling Time

the number of years required for a population to double in size at its current constant growth rate

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Rate of Natural Increase (RNI)

percentage at which a country’s population is growing or declining (without migration) CBR-CDR divided by 10

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Total Fertility Rate (TFR)

estimated average number of children born to each female in her childbearing years

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Carrying Capacity

maximum number of people that a particular area can sustainably support based on its available resources

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Dependency Ratio

number of people in a population who are considered dependents (younger than 15, older than 64) compared to the number of people in the working age group (usually 15-64)