United States vs Japan
United States has a population of 340.1M, compared to Japan's 123.2M. United States is 2.8 times more populous than Japan. Economically, United States ($28.75T) has a GDP 7.1 times larger than Japan's ($4.03T). United States covers 9,525,067 km², 25.2 times larger than Japan's 377,930 km². Life expectancy in Japan stands at 84.0 years, 5.7 years higher than United States's 78.4 years.
United StatesJapan| Population | +176.0%340.1M | -63.8%123.2M |
| Area | +2420.3%9,525,067 km² | -96.0%377,930 km² |
| GDP | +613.8%$28.75T | -86.0%$4.03T |
| GDP Per Capita | +160.2%$84,534.041 | -61.6%$32,487.078 |
| Life Expectancy | -6.7%78.4 yrs | +7.2%84.0 yrs |
| Infant Mortality | +205.6%5.5 | -67.3%1.8 |
| Literacy Rate | — | — |
| Unemployment | +71.3%4.2% | -41.6%2.5% |
| Capital | Washington, D.C. | Tokyo |
| Region | Americas | Asia |
| Languages | English | Japanese |
| Currencies | USD ($) | JPY (¥) |
Last updated: March 2026
All data sourced from World Bank Open Data (2025) and REST Countries API. Economic data may reflect most recent available year.
Population Comparison
United States is 2.8 times more populous than Japan, with 340.1M residents compared to 123.2M. United States is among the world's 15 most populous countries, while Japan is among the world's 15 most populous countries. In terms of population density, United States averages 36 people per km² (sparse), while Japan averages 326 people per km² (dense). United States has grown at 0.62% annually over the past decade. Population growth data is not available for Japan.
Economy Comparison
United States is classified as a high-income economy, while Japan is classified as a high-income economy. The United States economy ($28.75T) is 7.1 times larger than Japan's ($4.03T). United States's GDP per capita of $84,534.041 is 526% above the regional average of 13,500 for Americas. Japan's GDP per capita of $32,487.078 is 190% above the regional average of 11,200 for Asia. On a per-capita basis, residents of United States are on average 2.6 times wealthier than those in Japan.
Health & Quality of Life
Life expectancy in United States is 78.4 years, compared to 84.0 years in Japan, a gap of 5.7 years. Japan (84.0 years) is 12.0 years above the global average of 72 years, while United States (78.4 years) is 6.4 years above the global average of 72 years. At 5.5 deaths per 1,000 live births, United States's infant mortality is 206% higher than Japan's 1.8.
Geographic Comparison
United States (9,525,067 km²) is 25.2 times larger by land area than Japan (377,930 km²). United States shares borders with 2 countries, while Japan borders 0 countries. United States spans 11 timezones, compared to Japan's 1 timezone. United States lies in North America, while Japan is located in Asia. United States is categorized within the Americas region (North America), whereas Japan belongs to Asia (Eastern Asia).
Key Differences
The most significant difference between United States and Japan is in land area: United States's 9,525,067 km² compared to Japan's 377,930 km² represents a 96% gap. The most significant difference between United States and Japan is in GDP: United States's $28.75T compared to Japan's $4.03T represents a 86% gap. The most significant difference between United States and Japan is in infant mortality: United States's 5.5 per 1,000 compared to Japan's 1.8 per 1,000 represents a 67% gap. These disparities reflect the broader structural differences between United States's high-income economy and Japan's high-income economy.
At a Glance: What the Numbers Mean
Living Standards
United States has a GDP per capita of $84,534.041, which is 2.6x that of Japan ($32,487.078). This gap reflects differences in economic development, industrial structure, and workforce productivity. In practical terms, average purchasing power in United States is significantly higher, though cost of living differences partially offset the raw income gap.
Population Density
Japan is 9.1x more densely populated than United States (326 vs 36 people per km²). Higher density typically correlates with more urbanization, greater demand for public transit, and higher housing costs. United States's lower density suggests more rural land use and potentially lower urban congestion.
Healthcare and Longevity
Citizens of Japan live an average of 5.7 years longer than those of United States (84.0 vs 78.4 years). This gap reflects differences in healthcare access, nutrition, public health infrastructure, and environmental factors. This is a substantial gap that suggests significant differences in healthcare systems and overall living conditions.
Economic Momentum
United States's economy grew at 2.8% compared to Japan's 0.1%. Both countries show healthy growth, though United States has a modest edge in economic dynamism.
Frequently Asked Questions
Which is bigger, United States or Japan by population?
United States is larger by population, with 340.1M residents compared to Japan's 123.2M. United States is 2.8 times more populous than Japan.
Which country has a higher GDP, United States or Japan?
United States has the higher GDP at $28.75T, compared to Japan's $4.03T. United States's economy is 7.1 times larger.
How does life expectancy compare between United States and Japan?
Japan has a higher life expectancy at 84.0 years, compared to United States's 78.4 years. The gap between the two countries is 5.7 years. United States's life expectancy is 6.4 years above the global average of 72 years, while Japan's is 12.0 years above the global average of 72 years.
Which country is larger by area, United States or Japan?
United States is larger by land area, covering 9,525,067 km² compared to Japan's 377,930 km². United States is 25.2 times larger than Japan.
What languages are spoken in United States and Japan?
United States recognizes the following official language: English. Japan recognizes: Japanese. The two countries do not share an official language.
Which country has lower inflation, United States or Japan?
Japan has lower inflation at 2.7%, compared to United States's 2.9%. Japan's inflation is within the 2-3% range considered stable by most central banks, while United States's rate is within the 2-3% range considered stable by most central banks.