The TFR is usually simply described as the average number of children per woman which makes it an intuitive measure of fertility. The TFR is calculated by adding up all the age-specific fertility rates, multiplying this sum by five (the width of the age-group interval), and then dividing by 1,000.

How do you calculate GFR and TFR?

The population size is the same for each age. In this case, the GFR would equal the average of the age-specific fertility rate values, and the TFR would be the sum of the age-specific fertility rate values. In this case again, the TFR would equal the product of the GFR and the number of childbearing years.

What does a TFR of 2.1 mean?

The single most important factor in population growth is the total fertility rate (TFR). ... If, on average, women give birth to 2.1 children and these children survive to the age of 15, any given woman will have replaced herself and her partner upon death. A TFR of 2.1 is known as the replacement rate.