The Total Fertility Rate (TFR) is a fundamental demographic concept that estimates the average number of children a woman would have over her childbearing years, typically defined as ages 15 to 49. It is expressed as children per woman. The TFR was formally defined in the 1930s by demographers like Robert Kuczynski, building on the groundwork of age-specific fertility tables from 1884. Its creation solved the problem of the crude birth rate, which was misleading because it failed to account for differences in a population's age structure.
The TFR works as a synthetic cohort measure, calculated by summing the Age-Specific Fertility Rates (ASFRs) for women across the seven five-year age groups from 15-19 to 45-49. The sum of the ASFRs is multiplied by five (the width of the age interval) and then divided by 1,000 to yield the final rate.
The TFR is closely connected to the concept of Replacement-Level Fertility, which is a TFR of approximately 2.1 children per woman, the level required to maintain a stable population over time. A sustained TFR decline is a key feature of the Demographic Transition Model, driven by factors like increased female education, access to contraceptives, and declining infant mortality.
In India, the TFR has changed significantly, falling below the replacement level for the first time. The Sample Registration System (SRS) Statistical Report 2024, released by the Office of the Registrar General and Census Commissioner, reported the national TFR as 1.9 in 2024, a sharp drop from 3.6 in 1991. This decline means India's population is expected to eventually stabilize and then decline, though population momentum will keep it growing for some years.