Demographic indicators are used to measure various aspects of a population, such as birth rates, death rates, and population size. The total fertility rate (TFR) is a demographic indicator that is used to measure the average number of children a woman is expected to have in her lifetime. It is an important measure for understanding population growth and understanding the reproductive patterns within a population.

The TFR is calculated using several demographic indicators, but the sex ratio is not one of them. The sex ratio is the ratio of males to females in a population, usually expressed as the number of males per 100 females. While the sex ratio provides valuable information about the gender distribution within a population, it does not directly measure fertility or reproductive patterns.

The indicators used to calculate the TFR are:

a) Number of live births in the reproductive age group: This indicator measures the number of live births that occur among women of reproductive age, typically defined as ages 15-49. It provides information about the overall fertility level within a population.

b) Age-specific fertility rate: This indicator measures the number of live births that occur to women in specific age groups. By calculating the fertility rates for different age groups, we can understand how fertility patterns vary across different stages of a woman's reproductive life.

c) Number of women in the child-bearing age group: This indicator measures the number of women in the population who are within the age range where they are biologically capable of bearing children. It provides information about the potential pool of women who could contribute to the overall fertility rate.

The TFR is calculated by summing up the age-specific fertility rates for all age groups and then dividing by a constant factor. The result is an estimate of the average number of children that a woman would have in her lifetime if she were to experience the current age-specific fertility rates throughout her reproductive years.

In conclusion, while the sex ratio is an important demographic indicator, it is not used to calculate the total fertility rate. The TFR is calculated using indicators such as the number of live births in the reproductive age group, age-specific fertility rates, and the number of women in the child-bearing age group. These indicators provide insights into population growth and reproductive patterns within a population.