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.
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.
Learn MoreWhen the population experiences growth, it increases the number of people who can consume goods and services, causing the economy to experience growth. When the economy grows, this results in new industries that can provide employment to the nation's citizens.
Full Answer >Subtracting a past population value from the present population value, and dividing this result by the past population value, yields the population-growth rate. Multiplying the population-growth rate by 100 yields the growth percentage.
Full Answer >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.
Full Answer >According to Investopedia, to calculate an annual growth rate, take the ending value and divide it by the beginning value. Place that amount to the power of one over the number of years of growth, and subtract one from that amount. This averages growth over a period of years.
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