Q:

How do I calculate a population's growth rate?

A:

Quick Answer

Calculate population growth rate by dividing the change in population for the time by the initial population and multiplying by 100. The number is expressed as a percentage.

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Full Answer

Population growth rates are used for many sizes of geographic areas from a specific neighborhood to the world. These rates take into account the births and deaths occurring during the specified time along with people who move into and out of the area.

The world population first reached 1 billion in 1804 and took more than a century to double. It grew from 4.4 billion to 6 billion between the years 1980 and 2000. As of 2014, it is estimated at 7.2 billion. By 2024, it is projected to be greater than 8 billion.

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Related Questions

  • Q:

    What is the equation to calculate population growth?

    A:

    The basic equation for calculating population growth multiplies the population size by the per capita growth rate, which is calculated by subtracting the per capita death rate from the per capita birth rate. This simplistic calculation does not factor in the effects of migration or immigration on a population's size.

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  • Q:

    What is a demographic equation?

    A:

    A demographic equation is a formula that measures population change. It estimates the increase or decrease in population by adding the number of births plus the net migration to the previous count, then subtracting the number of deaths.

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  • Q:

    Why is demography important?

    A:

    The importance of demography lies in its contribution to helping government and society better prepare to deal for the issues and demands of population growth, aging and migration. The statistics and predictions resulting from demographic studies can, for example, aid in the development of adequate school systems, estimate the required funding for senior services and develop workable healthcare systems. A wide variety of social outcomes are impacted by demographic processes and distributions.

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  • Q:

    Who is Thomas Malthus and what did he predict?

    A:

    Thomas Robert Malthus was an English cleric, scholar and economist who predicted that unchecked population growth would lead to famine and disease. His seminal work was titled "An Essay on the Principle of Population as it Affects the Future Improvement of Society, with Remarks on the Speculations of Mr. Godwin, Mr. Condorcet, and Other Writers."

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