United Kingdom vs Japan
United Kingdom has a population of 69.3M, compared to Japan's 123.2M. Japan is 1.8 times more populous than United Kingdom. Economically, Japan ($4.03T) has a GDP 1.1 times larger than United Kingdom's ($3.69T). Japan covers 377,930 km², 1.5 times larger than United Kingdom's 244,376 km². Life expectancy in Japan stands at 84.0 years, 2.8 years higher than United Kingdom's 81.2 years.
United KingdomJapan| Population | -43.8%69.3M | +77.8%123.2M |
| Area | -35.3%244,376 km² | +54.7%377,930 km² |
| GDP | -8.5%$3.69T | +9.3%$4.03T |
| GDP Per Capita | +63.9%$53,246.368 | -39.0%$32,487.078 |
| Life Expectancy | -3.3%81.2 yrs | +3.5%84.0 yrs |
| Infant Mortality | +122.2%4.0 | -55.0%1.8 |
| Literacy Rate | — | — |
| Unemployment | +93.6%4.7% | -48.4%2.5% |
| Capital | London | Tokyo |
| Region | Europe | Asia |
| Languages | English | Japanese |
| Currencies | GBP (£) | 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
Japan is 1.8 times more populous than United Kingdom, with 123.2M residents compared to 69.3M. United Kingdom is among the world's 30 most populous countries, while Japan is among the world's 15 most populous countries. In terms of population density, United Kingdom averages 284 people per km² (dense), while Japan averages 326 people per km² (dense). United Kingdom has grown at 0.66% annually over the past decade. Population growth data is not available for Japan.
Economy Comparison
United Kingdom is classified as a high-income economy, while Japan is classified as a high-income economy. The Japan economy ($4.03T) is 1.1 times larger than United Kingdom's ($3.69T). United Kingdom's GDP per capita of $53,246.368 is 90% above the regional average of 28,000 for Europe. 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 Kingdom are on average 1.6 times wealthier than those in Japan.
Health & Quality of Life
Life expectancy in United Kingdom is 81.2 years, compared to 84.0 years in Japan, a gap of 2.8 years. Japan (84.0 years) is 12.0 years above the global average of 72 years, while United Kingdom (81.2 years) is 9.2 years above the global average of 72 years. At 4.0 deaths per 1,000 live births, United Kingdom's infant mortality is 122% higher than Japan's 1.8.
Geographic Comparison
Japan (377,930 km²) is 1.5 times larger by land area than United Kingdom (244,376 km²). United Kingdom shares borders with 1 country, while Japan borders 0 countries. United Kingdom spans 9 timezones, compared to Japan's 1 timezone. United Kingdom lies in Europe, while Japan is located in Asia. United Kingdom is categorized within the Europe region (Northern Europe), whereas Japan belongs to Asia (Eastern Asia).
Key Differences
The most significant difference between United Kingdom and Japan is in infant mortality: United Kingdom's 4.0 per 1,000 compared to Japan's 1.8 per 1,000 represents a 55% gap. The most significant difference between United Kingdom and Japan is in population: United Kingdom's 69.3M compared to Japan's 123.2M represents a 44% gap. The most significant difference between United Kingdom and Japan is in GDP per capita: United Kingdom's $53,246.368 compared to Japan's $32,487.078 represents a 39% gap. These disparities reflect the broader structural differences between United Kingdom's high-income economy and Japan's high-income economy.
At a Glance: What the Numbers Mean
Living Standards
United Kingdom has a GDP per capita of $53,246.368, which is 1.6x 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 Kingdom is significantly higher, though cost of living differences partially offset the raw income gap.
Population Density
Japan is 1.1x more densely populated than United Kingdom (326 vs 284 people per km²). Higher density typically correlates with more urbanization, greater demand for public transit, and higher housing costs. United Kingdom's lower density suggests more rural land use and potentially lower urban congestion.
Healthcare and Longevity
Citizens of Japan live an average of 2.8 years longer than those of United Kingdom (84.0 vs 81.2 years). This gap reflects differences in healthcare access, nutrition, public health infrastructure, and environmental factors. This is a moderate difference that could narrow with continued development.
Economic Momentum
United Kingdom's economy grew at 1.1% compared to Japan's 0.1%. Both economies are growing slowly, which may reflect maturity or structural challenges.
Frequently Asked Questions
Which is bigger, United Kingdom or Japan by population?
Japan is larger by population, with 123.2M residents compared to United Kingdom's 69.3M. Japan is 1.8 times more populous than United Kingdom.
Which country has a higher GDP, United Kingdom or Japan?
Japan has the higher GDP at $4.03T, compared to United Kingdom's $3.69T. Japan's economy is 1.1 times larger.
How does life expectancy compare between United Kingdom and Japan?
Japan has a higher life expectancy at 84.0 years, compared to United Kingdom's 81.2 years. The gap between the two countries is 2.8 years. United Kingdom's life expectancy is 9.2 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 Kingdom or Japan?
Japan is larger by land area, covering 377,930 km² compared to United Kingdom's 244,376 km². Japan is 1.5 times larger than United Kingdom.
What languages are spoken in United Kingdom and Japan?
United Kingdom recognizes the following official language: English. Japan recognizes: Japanese. The two countries do not share an official language.
Which country has lower inflation, United Kingdom or Japan?
Japan has lower inflation at 2.7%, compared to United Kingdom's 3.3%. Japan's inflation is within the 2-3% range considered stable by most central banks, while United Kingdom's rate is moderately elevated above the global median of 3.5%.