The map above shows Ireland and Japan side by side at exactly the same scale, using equal-area projections, so their true relative sizes are preserved.
Ireland vs Japan Geography
Land area
- Ireland has a land area of 26,596 square miles (68,883 km²), while Japan has 140,752 square miles (364,546 km²).
- Japan's land area is 5.3 times (429%) larger than Ireland's.
Total area
- Ireland: 27,133 square miles (70,273 km²) vs Japan: 145,937 square miles (377,975 km²), including inland and coastal water.
- Japan's total area is 5.4 times (438%) larger than Ireland's.
Length
- Ireland is 287 miles (462 km) long from north to south; Japan is 1,557 miles (2,505 km).
- Japan's north-south length is 5.4 times (443%) longer than Ireland's.
Width
- Ireland spans 191 miles (308 km) east to west; Japan spans 1,568 miles (2,524 km).
- Japan's east-west width is 8.2 times (721%) wider than Ireland's.
Highest point
- Ireland's highest point is Carrauntoohil at 3,406 feet (1,038 m); Japan's is Mount Fuji at 12,388 feet (3,776 m).
- Mount Fuji is 8,982 feet higher than Carrauntoohil.
Lowest point
- Ireland's lowest point is Atlantic Ocean at 0 feet; Japan's is Hachirogata at -13 feet.
- Japan's lowest point is 13 feet lower.
Ireland vs Japan Population and History
Population
- Ireland has a population of 5,525,600 (2026), while Japan has 122,680,000 (2026).
- Japan's population is 22.2 times larger than Ireland's.
Population density
- Ireland: 207.8 people per square mile vs Japan: 871.6.
- Japan's population density is 4.2 times (319%) higher than Ireland's.
Biggest city
- Ireland's biggest city is Dublin with 592,713 people; Japan's is Tokyo with 13,515,271.
- Tokyo's population is 22.8 times larger than Dublin's.
Largest metro area
- Ireland's largest metropolitan area is Greater Dublin Area (2,082,605 people) vs Japan's Tokyo (33,412,512).
- Tokyo's population is 16.0 times larger than Greater Dublin Area's.
History
- Ireland: Independent since December 6, 1922, as the Irish Free State; a republic since 1949.
- Japan: An independent state for over two millennia; the current constitution dates from 1947.
- In its current form, Japan is the older of the two by 1,262 years.
Ireland vs Japan Economy
GDP
- Ireland's GDP is $721.7 billion (2025) vs Japan's $4,435.2 billion.
- Japan's economic output is 6.1 times (515%) larger than Ireland's.
GDP per capita
- Ireland: $131,593 per person vs Japan: $35,951.
- Ireland's GDP per capita is 3.7 times (266%) higher than Japan's.
Average income
- Ireland: $87,360 vs Japan: $38,340 average income per person (per capita personal income).
- Ireland's average income is 2.3 times (128%) higher than Japan's.
Official Websites
Ireland official website · Japan official website
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More Size Comparisons
All Ireland size comparisons · All Japan 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.