Total Fertility Rate

Average number of children a woman would have over her lifetime if current age-specific birth rates remain constant.

Quick Reference

Unit

births per woman

How It's Calculated

Sum of age-specific fertility rates (births per woman in each 5-year age group from 15-49) divided by 1,000. Uses vital registration data (births by mother's age) or household surveys (DHS, MICS). Assumes current birth rates persist throughout a woman's reproductive years (synthetic cohort approach).

Why It Matters

Fertility rate is the primary driver of population growth and age structure. Replacement-level fertility (2.1 births per woman) maintains population stability. Rates below 2.1 lead to population aging and eventual decline, while rates above 3.0 create youth bulges with education and employment challenges. Fertility reflects women's education, economic development, healthcare access, and cultural norms. It is central to SDG 3.7 (reproductive health).

Understanding the Values

Very Low Fertility: < 1.5 (population decline - South Korea 0.7, Spain 1.2, Italy 1.2) Low Fertility: 1.5-2.1 (below replacement - China 1.2, Thailand 1.0, USA 1.7) Replacement Level: 2.1 (stable population - no net growth or decline) Moderate Fertility: 2.1-3.0 (moderate growth - India 2.0, Mexico 2.0) High Fertility: 3.0-5.0 (rapid growth - Pakistan 3.5, Egypt 3.3) Very High Fertility: > 5.0 (pre-transition - Niger 6.1, Chad 5.8) Global average: 2.25 births per woman (2024) Projected to reach 2.1 (replacement) by late 2040s SDG Target 3.7: Universal access to family planning by 2030

Related Metrics

Under-5 Mortality Rate

Probability of dying between birth and age 5, expressed per 1,000 live births.

Median Age of Population

The age that divides a population into two numerically equal groups - half younger, half older.

Maternal Mortality Ratio

Number of maternal deaths during pregnancy or within 42 days of termination, per 100,000 live births.

Population Growth Rate

Annual percentage change in total population, reflecting the combined effect of births, deaths, and net migration.

Data Quality & Coverage

Coverage: 217 countries Update frequency: Annual (estimates), surveys every 3-5 years Source: World Bank (UN Population Division estimates) Limitations: Vital registration only available in ~80 countries; others rely on survey-based estimates with 3-5 year lags. Does not capture timing of births (delayed childbearing) or childlessness rates. Affected by abortion access, contraception availability, and cultural factors not measured here.