Japan vs Nigeria
Nigeria has 1.9× the population of Japan: 237,527,782 vs 123,366,734, a gap of 114.2 million. Nigeria is growing faster (+2.06% vs −0.49% a year), adding about 4,898,468 people a year against −607,141. At these source-year rates the modelled relative population gap is widening. Japan is the older society: 30.0% aged 65+ against 3.1% in Nigeria, while Nigeria has more children (40.5% under 15 vs 11.2%). Japan is 1.4× as densely populated (341.5 vs 250.2 people per km²). People in Japan live 29.4 years longer on average (84.0 vs 54.6). GDP per capita is 29.4× higher in Japan ($35,951 vs $1,224).
Country/territory population bases: World Bank 2025 (Japan) and 2025 (Nigeria); growth years 2025 / 2025. Annual source values, not live counts; years may differ. Growth is national, not local.
Japan vs Nigeria — side by side
 Japan |  Nigeria | |
|---|---|---|
| Population | 123,366,7342025 | 237,527,7822025 |
| Growth rate / yr | −0.49%2025 | +2.06%2025 |
| Births per 1,000 | 5.72024 | 32.52024 |
| Deaths per 1,000 | 13.32024 | 11.62024 |
| Children per woman | 1.152024 | 4.382024 |
| Life expectancy | 84.0 yrs2024 | 54.6 yrs2024 |
| Aged 0–14 | 11.2%2025 | 40.5%2025 |
| Aged 65+ | 30.0%2025 | 3.1%2025 |
| Density | 341.5 /km²2023 | 250.2 /km²2023 |
| Area | 377,969 km²2023 | 923,770 km²2023 |
| Urban population | 92.3%2025 | 63.8%2025 |
| Net migration / yr | +140,5792025 | -15,2582025 |
| GDP per capita | $35,9512025 | $1,2242025 |
| Country population rank (available records) | #12 | #6 |
| Base / world population (World Bank 2025) | 1.50% | 2.89% |
Highlighted cell = the higher value (not "better"). Small print under each value is its own data year. Source: World Bank; country/territory population bases may have different years. These are not live counts.
Population since 1960
World Bank population history (not the separate UN WPP timeline). Japan: 1.3× from 1960 to 2025; Nigeria: 5.3× from 1960 to 2025. Left: absolute population. Right: each series indexed to its own first available year = 100; baseline years may differ.
More comparisons
Regions: East Asia & Pacific · Sub-Saharan Africa · rankings
Japan: Japan vs India, Japan vs China, Japan vs United States, Japan vs Indonesia, Japan vs Pakistan, Japan vs Nigeria, Japan vs Brazil, Japan vs Bangladesh.
Nigeria: Nigeria vs India, Nigeria vs China, Nigeria vs United States, Nigeria vs Indonesia, Nigeria vs Pakistan, Nigeria vs Brazil, Nigeria vs Bangladesh, Nigeria vs Russia.
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