Fertility rate or Total Fertility Rate (TFR) is the average number of children a woman will be able to bear if she survives till the end of her reproductive life and goes through the age-specific fertility rate in her life. Fertility rate is also referred to as the Period Total Fertility Rate (PTFR) or Total Period Fertility Rate (TPFR).
Map of Total Fertility Rate in the World
The fertility rate however, is not actually calculated. In other words, this rate is not representative of any group of women. It is simply an estimation of number of children a woman might have in the course of her life.