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

## 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.

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.

Reference:
Q&A Related to "How do I calculate a population's growth rate?"
 1. Choose the location for which you want to calculate the population growth rate. This could be for the entire United States, a specific region, state or smaller area, depending http://www.ehow.com/how_4899359_calculate-populati...
 death rate is subtracted from birth rate. http://wiki.answers.com/Q/When_calculating_global_...
 Birth rate (b) death rate (d) = rate of natural increase (r). Thank http://www.chacha.com/question/how-is-growth-rate-...
 1. Obtain data that shows a change in a quantity over time. All you need to calculate a basic growth rate are two numbers - one that represents a certain quantity's starting value http://www.wikihow.com/Calculate-Growth-Rate
1 Additional Answer
Ask.com Answer for: how to calculate population growth rate
How to Calculate the Population Growth Rate
The population of the United States changes on a continual basis. Knowing this rate of change is important to both the government and private businesses. The population growth or decline in an area can help a company decide where it wishes to locate its... More »
Difficulty: Moderately Challenging
Source: www.ehow.com
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