Q.What is meant by the natural growth rate of population? Give its formula.

Natural growth rate isolates population change caused purely by births and deaths, excluding migration.

The natural growth rate of population measures the rate at which a population changes due to births and deaths alone, excluding the effect of migration into or out of the area. It is calculated simply as the difference between the Crude Birth Rate and the Crude Death Rate:

If the CBR exceeds the CDR, the natural growth rate is positive and the population grows; if the CDR exceeds the CBR, the natural growth rate is negative and the population declines (ignoring migration). In India, the natural growth rate rose sharply during the mid-twentieth century as death rates fell much faster than birth rates (the classic Stage 2 pattern of demographic transition), and it has been gradually declining in recent decades as birth rates have also started falling, moving India towards Stage 3. The natural growth rate is distinct f …

Confusing 'natural growth rate' with the overall population growth rate shown by successive Censuses, whi …