# How to Calculate the Average Fertility Rate for a Certain Age Group You’re probably wondering how to calculate the average fertility rate for a specific age group. In this article, you’ll learn about age-specific fertility rates and net migration. In addition, you’ll learn about the gross reproduction rate. Let’s get started! How to Calculate the Average Fertility Rate for a Certain Age Group

## Age-specific fertility rate

Age-specific fertility rates are based on information from national statistics offices. Age-specific fertility rates are calculated based on the available data for each country’s civil registration system. The data are reported to the United Nations Statistics Division, regional statistical units, and other sources. These data are often drawn from analytical publications and reports produced by national statistical offices. They are used in public health and population estimates. This type of analysis is used to determine whether or not specific measures of fertility are effective in improving public health.

The age-specific fertility rate is a ratio between live births and the female population. It is calculated using data for the calendar year as the reference period. This measure enables comparisons of fertility rates between countries. The World Fertility Data 2008 uses the calendar year as the reference period for calculation. This ratio is expressed as births per 1,000 women. For the purposes of comparison, age-specific fertility rates are useful because they account for the effect of population age structure.

## Gross reproduction rate

The gross reproduction rate is the number of births of a particular gender, usually girls, in a given year. This statistic gives a general idea of a woman’s future fertility prospects. To calculate the gross reproduction rate, multiply the TFR per woman by the percentage of births of women in a given year. If a woman has given birth to one child in a year, then she can have as many as four daughters during her lifetime.

The net reproduction rate (NRR) refines the gross reproduction rate by factoring in mortality. This factor increases the difference between the GRR and the NRR. In countries where infant mortality is low, the net reproduction rate is always lower than the gross reproduction rate. But in countries with a low mortality rate, baby girls grow up and become potential mothers. For example, the U.S. has a higher gross reproduction rate than the U.K.

## Net migration

The United Nations Population Division provides data on migration and the migrant stock. When it comes to calculating the fertility rate, it takes into account the migration history, the policy governing migration and the influx of refugees during recent periods. This data is then analyzed by different statistical agencies, including the U.S. Census Bureau. A fertility rate is also derived using the population growth rate and the natural increase rate.

The total fertility rate is the number of babies born per woman in a given country. Historically, TFRR has tended to be negative, although the rate of net migration has decreased over the past several decades. This is not surprising considering the current low fertility rate of many developed countries. In a study of 22 countries from 2011 to 2015, the researchers calculated the Current Migration Replacement (CMR) for the metric. When the two are combined, the CMR yields a stationary population equal to the mid-period population. The TFRR ranges from 0.60 for Singapore to 2.05 for Slovakia.

## Age-specific fertility rate for age group 10-14

The age-specific fertility rate (ASFR) of a particular group of women is calculated by dividing the number of live births in the group by the average number of females in that age group. For example, for the age group 10-14, the calculation uses the female population of this age group. For the age group 15-19, the calculation is the same but for women under the age of 20, it is the female population of this age group and the percentage of females in the group is added together.

TFR is the average number of children a woman would have in her lifetime, divided by the number of women in each age group. It is not an accurate indicator of the number of children young women would have if they went through their childbearing years in a single year. But it is a better estimate of fertility than the age-specific fertility rate. And since the ASFR of age group 10-14 is so small, this figure is only useful in the short term.