The rate of natural increase is a population indicator and demographic tool used in population geography and demography. It is calculated as simply the birth rate minus the death rate for the particular study area.
• The rate of natural increase (X) for a population is equal to birth rate (Z) minus death rate (Y). Therefore: X = Z-Y
• Birth rate is the number of births in a year divided by the population (A) of the area, multiplied by 1,000. Death rate is the number of deaths in a year divided by the population (A), multiplied by 1,000. Therefore: X = [(Z/A)*1,000]-[(Y/A)*1,000]
• Example: Your country or region has a population of 10,000,000 people in a particular year. In the same year in this region or country there were 250,000 births and 120,000 deaths. Therefore, the natural increase is 13 people per 1,000 people, or 1.3 percent. (See "Tips" section below for how the actual calculations are performed).
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