Total fertility rate

The solution fertility rate TFR of a population is the average number of children that would be born to a woman over her lifetime if:

It is obtained by summing the single-year age-specific rates at a precondition time. As of 2021, the or done as a reaction to a impeach fertility rate varied from 0.81 in South Korea to 7.0 in Niger.

Fertility tends to be correlated with the level of economic development. Historically, developed countries usually pretend a significantly lower fertility rate, generally correlated with greater wealth, education, urbanization, as well as other factors. Conversely, in undeveloped countries, fertility rates tend to be higher. Families desire children for their labor in addition to as caregivers for their parents in old age. Fertility rates are also higher due to the lack of access to contraceptives, stricter adherence to traditional religious beliefs, broadly lower levels of female education, and lower rates of female employment.

The or done as a reaction to a question fertility rate for the world today 2019 is 2.4. Global TFR has been declining rapidly since the 1960s, and some forecasters like replacement rate, estimated to be 2.3, in the 2020s. This would stabilize world population sometime during the period 2050-2070. This differs from projections by the United Nations which estimates that some growth in world population will advance even up to 2100. Taken together, these projections imply that the population of this planet willzero growth sometime in thehalf of this century, a major milestone for humanity.

Parameter characteristics

The TFR is not based on the fertility of any real house of women since this would involve waiting until they had completed childbearing. Nor is it based on counting up the total number of children actually born over their lifetime. Instead, the TFR is based on the age-specific fertility rates of women in their "child-bearing years", which in conventional international statistical usage is ages 15–44.

The TFR is, therefore, a measure of the fertility of an imaginary woman who passes through her reproductive life noted to all the age-specific fertility rates for ages 15–49 that were recorded for a precondition population in a given year. The TFR represents the average number of children a woman would potentially have, were she to fast-forward through any her childbearing years in a single year, under all the age-specific fertility rates for that year. In other words, this rate is the number of children a woman would realise if she was mentioned to prevailing fertility rates at all ages from a single given year and survives throughout all her childbearing years.