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# How do I calculate a population's growth rate?

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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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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

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The crude death rate can be calculated by taking the number of deaths caused by a disease and dividing that number by the total population at risk of contracting that disease. The decimal is then multiplied by a constant, usually 1,000 or 100,000, to give a whole number.

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The crude birth rate is calculated by dividing the number of the total population by the number of births in one year, according to Columbia University. The CBR of a population can be used to assign a stage of development.

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The Business Dictionary defines exponential growth as an increase in number or size at a constantly increasing rate. Math Planet explains that exponential growth is represented by an exponential function, which is a nonlinear function with the form, y = ab^x, where a does not equal zero and b is greater than zero. The graph of any exponential growth function rises from left to right in a curved line.