Japan vs United Kingdom
Side-by-side economic and demographic comparison · 2026 data · Source: IMF & World Bank
Japan and the United Kingdom are the world's fourth and sixth largest economies with surprising economic parallels. Both are island nations with aging populations, large financial sectors, and economies that punch above their demographic weight. Japan's economy is roughly 40% larger than the UK's, driven by manufacturing (Toyota, Sony, Panasonic), while the UK is more services-oriented. Both have central banks that have experimented with unconventional monetary policy — the Bank of Japan pioneered quantitative easing in 2001, and the Bank of England adopted it in 2009.
Japan has a GDP of $4.38T compared to United Kingdom's $4.26T, making it 1.0x larger. Japan's population is 123.4M vs United Kingdom's 69.5M. Across 12 key indicators, both countries are evenly matched in categories. All data sourced from the IMF World Economic Outlook and World Bank World Development Indicators.
| Indicator |  Japan |  United Kingdom |
|---|---|---|
| GDP (USD) | $4.38T✓ | $4.26T |
| GDP per Capita | $35,703 | $61,056✓ |
| GDP Growth (%) | 0.7% | 0.8%✓ |
| GDP per Capita (PPP) | $59,207 | $67,585✓ |
| Population | 123.4M✓ | 69.5M |
| Life Expectancy | 84.0 years✓ | 81.4 years |
| Inflation (%) | 2.2%✓ | 3.2% |
| Unemployment (%) | 2.5%✓ | 5.6% |
| Govt Debt (% GDP) | 204.4% | 103.6%✓ |
| Fertility Rate | 1.1 | 1.6✓ |
| Gini Index | 32.3✓ | 32.4 |
| CO₂ per Capita (t) | 7.8 | 4.2✓ |
Summary
Japan has a GDP of $4.38T compared to United Kingdom's $4.26T, making the former economy 1.0x larger. In terms of population, Japan has 123.4M people while United Kingdom has 69.5M. Across the 12 indicators compared, Japan leads in 6 and United Kingdom leads in 6.
Why sources report different numbers
The IMF, World Bank and United Nations each publish these series on their own release schedule. Where their figures differ, the reason is usually visible in the reference year rather than in the methodology.
| Source | Japan | United Kingdom |
|---|---|---|
| IMF | $4.38T2026 | $4.26T2026 |
| World Bank | $4.44T2025 | $4.00T2025 |
| United Nations | $4.03T2024 | $3.69T2024 |
These are not the same reference year. IMF publishes 2026 and United Nations publishes 2024 — each is the latest that publisher has released, on its own schedule. A figure for a year still in progress is a projection rather than an outturn. Japan spans about 10% across 1 year; United Kingdom spans about 16% across 2 years.
| Source | Japan | United Kingdom |
|---|---|---|
| IMF | $35,7032026 | $61,0562026 |
| World Bank | $35,9512025 | $57,6022025 |
| United Nations | $32,5342024 | $53,3122024 |
These are not the same reference year. IMF publishes 2026 and United Nations publishes 2024 — each is the latest that publisher has released, on its own schedule. A figure for a year still in progress is a projection rather than an outturn. Japan spans about 11% across 1 year; United Kingdom spans about 15% across 2 years.
Figures are reproduced as published by each source, converted to a common unit, with each publisher's own reference year shown. Differences are described, not adjudicated — no source is presented as more correct than another.
JapanUnited Kingdom