How to Calculate Crude Birth Rate


Crude birth rate is the childbirths per 1,000 people per year. This is a common measure of fertility for a given population. Crude birth rate is frequently used in population geography and demography and is a useful indicator in studies of population around the world. The crude birth rate could be of concern for particular countries who may be experiencing population decline, or for national governments who are worried about population growth rates that are higher than their country can sustain. This article will show you how to quickly calculate the crude birth rate for any given population.

Things You'll Need

  • calculator
  • The crude birth rate (CBR) is equal to the number of live births (b) in a year divided by the total midyear population (p). This number is then usually multiplied by 1,000 to arrive at the actual crude birth rate.

  • Therefore, the formula for crude birth rate is:
    CBR = (b/p)*1000

  • Example. In 2007, there were 3,250 births in a city with population of 223,000. Therefore:
    CBR = (3,250/223,000)*1,000
    CBR = 14.57
    So, there were 14.57 births for every 1,000 people in the city.

Tips & Warnings

  • The crude birth rate is considered "crude" because is ignores the age structure of the population and it doesn't take into account who among the population were actually able to give birth.

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