The map above shows Japan and United Kingdom side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Japan vs United Kingdom Geography
Land area: Japan has a land area of 140,752 square miles (364,546 km²), while United Kingdom has 93,410 square miles (241,930 km²). Japan's land area is 1.5 times (51%) larger than United Kingdom's.
Total area: Japan: 145,937 square miles (377,975 km²) vs United Kingdom: 94,058 square miles (243,610 km²), including inland and coastal water. Japan's total area is 1.6 times (55%) larger than United Kingdom's.
Length: Japan is 1,557 miles (2,505 km) long from north to south; United Kingdom is 747 miles (1,202 km). Japan's north-south length is 2.1 times (108%) longer than United Kingdom's.
Width: Japan spans 1,568 miles (2,524 km) east to west; United Kingdom spans 429 miles (690 km). Japan's east-west width is 3.7 times (266%) wider than United Kingdom's.
Highest point: Japan's highest point is Mount Fuji at 12,388 feet (3,776 m); United Kingdom's is Ben Nevis at 4,413 feet (1,345 m). Mount Fuji is 7,975 feet higher than Ben Nevis.
Lowest point: Japan's lowest point is Hachirogata at -13 feet; United Kingdom's is The Fens (Holme Fen) at -10 feet. Japan's lowest point is 3 feet lower.
Japan vs United Kingdom Population and History
Population: Japan has a population of 122,680,000 (2026), while United Kingdom has 69,487,000 (2025). Japan's population is 1.8 times (77%) larger than United Kingdom's.
Population density: Japan: 871.6 people per square mile vs United Kingdom: 743.9. Japan's population density is 1.2 times (17%) higher than United Kingdom's.
Biggest city: Japan's biggest city is Tokyo with 13,515,271 people; United Kingdom's is London with 8,825,001. Tokyo's population is 1.5 times (53%) larger than London's.
Largest metro area: Japan's largest metropolitan area is Tokyo (33,412,512 people) vs United Kingdom's London (10,416,420). Tokyo's population is 3.2 times (221%) larger than London's.
History: Japan: An independent state for over two millennia; the current constitution dates from 1947. United Kingdom: Formed as the United Kingdom of Great Britain and Ireland on January 1, 1801; took its current form in 1922. In its current form, Japan is the older of the two by 1,141 years.
Japan vs United Kingdom Economy
GDP: Japan's GDP is $4,435.2 billion (2025) vs United Kingdom's $4,002.6 billion. Japan's economic output is 1.1 times (11%) larger than United Kingdom's.
GDP per capita: Japan: $35,951 per person vs United Kingdom: $57,602. United Kingdom's GDP per capita is 1.6 times (60%) higher than Japan's.
Average income: Japan: $38,340 vs United Kingdom: $54,550 average income per person (per capita personal income). United Kingdom's average income is 1.4 times (42%) higher than Japan's.
Official Websites
Japan official website · United Kingdom official website
More Size Comparisons
All Japan size comparisons · All United Kingdom size comparisons
Area, elevation and boundary figures come from official national statistics and US Census Bureau and Natural Earth boundary data; US state population, economic, county and tax figures come from the US Census Bureau, the Bureau of Economic Analysis and the Tax Foundation. Figures are rounded and for general reference.