Fertility in Japan, 2018
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2018
Total fertility rate: 1.37
The total fertility rate of Japan was 1.37 children per woman in 2018 — below the replacement level of about 2.1. Births were most frequent among women aged 30-34 (99 per 1,000 women in that age group), and the average mother was 31.4 years old. In total, 910,945 babies were born. Source: United Nations, World Population Prospects 2024.
Key indicators, 2018
Total fertility rate
1.37
Births
910,945
Births per 1,000 people
7.2
Mean age of mothers
31.4
Births to mothers aged 15–19
1.0%
Net reproduction rate
0.66
Boys per 100 girls at birth
105.2
Population
126,913,432
The net reproduction rate counts only daughters who survive to their mothers' age: below 1, each generation of women is smaller than the one before.
Fertility by age of mother, 2018
| Mother's age | Births per 1,000 women | Share of total fertility | Births |
|---|---|---|---|
| 10-14 | 0.0 | 0.0% | 52 |
| 15-19 | 3.1 | 1.1% | 8,990 |
| 20-24 | 25.9 | 9.5% | 75,937 |
| 25-29 | 78.3 | 28.6% | 231,847 |
| 30-34 | 99.3 | 36.3% | 332,286 |
| 35-39 | 55.7 | 20.4% | 209,804 |
| 40-44 | 10.9 | 4.0% | 49,888 |
| 45-49 | 0.4 | 0.2% | 2,144 |
| 50-54 | 0.0 | 0.0% | 0 |
Fertility in Japan by year