Crude birth rate is how many live children are born. Crude death rate is how many people die. Crude death minus crude birth is the net gain (or loss) and is called the birth rate. It represents whether or not deceased people are "replaced".

The crude birth rate of India is approximately 22.1/1000

Death Rate is the actual rate of death where Crude Death Rate is a guess on the death rate.

Is the crude birth rate minus the crude death rate of a population

The formula for finding the rate of natural increase is as follows: (Crude birth rate - Crude Death Rate) / 10. The result is the rate of natural increase in percentage form. For example, Paraguay's crude birth rate (28.47) - the crude death rate (4.49) is 23.98; divide that by 10 and the result is 2.39%, Paraguay's rate of natural increase.