Japan vs California: size comparison
California is 12% bigger than Japan: 163,694 sq mi (423,965 km²) versus 145,937 sq mi (377,975 km²). In other words, Japan fits into California 1.12 times. Here you can see both overlaid at their true size, with their population, density and end-to-end distance.
By the Mapsfera Team
1.12× Japan fits into California 1.12 times
- California 163,694 sq mi below, in its real place
- Japan 145,937 sq mi on top, centered on California
Drag both across a Mercator map and watch how they change with latitude.
Lambert azimuthal equal-area projection centered on California: it preserves areas, so both appear in their true proportion. Japan has been rotated across the globe, without changing its shape or size, until its center sits on the center of California.
The figures
| Figure | Japan | California |
|---|---|---|
| Area | 145,937 sq mi 377,975 km² · World Bank | 163,694 sq mi 423,965 km² · US Census Bureau |
| Population | 123 million World Bank, 2025 | 39.4 million Census, 2025 |
| Density | 845 per sq mi 326 per km² | 240 per sq mi 93 per km² |
| End to end | about 1,600 mi (2,580 km) | about 830 mi (1,340 km) |
| Size rank | 62nd of 193 countries | 3rd of 50 states |
| Mercator enlarges it | ×1.6 centered at 37° N | ×1.6 centered at 37° N |
Which is bigger, Japan or California?
Japan is an archipelago of four large islands and thousands of small ones stretching from northeast to southwest; California is a single block. Even so, their areas are very similar.
The difference is 17,757 sq mi (45,990 km²), roughly the size of Estonia (17,506 sq mi).
Japan is the 62nd-largest country in the world, and California is the 3rd-largest US state.
The Census Bureau’s area for California includes water: 7,834 sq mi (20,289 km²) of lakes, rivers and coastal water. Land alone is 155,861 sq mi (403,677 km²).
Population and density
Japan has a population of 123 million (World Bank, 2025) and California 39.4 million (US Census Bureau, July 1, 2025 estimate).
That’s 845 per sq mi (326 per km²) in Japan and 240 per sq mi (93 per km²) in California: Japan has 3.52 times as many people per square mile as California.
Although it’s smaller, Japan has more people: 3.13 times as many as California.
Why they look different on a regular world map
On the Mercator projection, used by Google Maps and many world maps, everything gets bigger the farther it is from the equator. Japan, centered at 37° N, comes out 1.6 times bigger than it really is overall; California, at 37° N, 1.6 times.
Because Mercator enlarges both by about the same amount, those maps show them roughly in proportion: on paper California takes up 1.10 times the space of Japan, and in reality 1.12 times.
That doesn’t happen on the map on this page: it uses an equal-area projection centered on California. To move them across a Mercator map yourself, open them in the True size map.
From end to end
The longest straight line between two points of Japan is about 1,600 mi (2,580 km), running southwest to northeast; for California it’s about 830 mi (1,340 km), northwest to southeast.
End to end, Japan is 93% longer than California, even though it covers less area: its shape is more stretched out.
Frequently asked questions
Is Japan bigger than California?
No. Japan covers 145,937 sq mi (377,975 km²) and California 163,694 sq mi (423,965 km²): California is 12% bigger.
How many times does Japan fit into California?
1.12 times: 163,694 sq mi (423,965 km²) divided by 145,937 sq mi (377,975 km²). These are the same areas as in the True size map (World Bank and US Census Bureau).
Which has more people, Japan or California?
Japan: 123 million people versus 39.4 million (3.13 times as many). Per square mile, 845 per sq mi (326 per km²) in Japan and 240 per sq mi (93 per km²) in California.
Which US state is about the size of Japan?
Montana (147,043 sq mi) and New Mexico (121,593 sq mi) are the states closest in area to Japan, which covers 145,937 sq mi (377,975 km²).
More comparisons
All comparisons- Texas vs California California fits into Texas 1.64 times
- Spain vs California California fits into Spain 1.19 times
- Italy vs Florida Florida fits into Italy 1.99 times
- Germany vs Montana Germany fits into Montana 1.06 times
- Ireland vs West Virginia West Virginia fits into Ireland 1.12 times
- Alaska vs Texas Texas fits into Alaska 2.18 times
- Compare country sizes Drag countries across the map to see their true size, free from the stretch of the Mercator projection.
Sources
- Country outlines (Admin 0, 1:10m) · Natural Earth (public domain)
- State outlines (Cartographic Boundary Files) · US Census Bureau (public domain)
- Country area (AG.SRF.TOTL.K2), when it matches the map (±10%) · World Bank (CC BY 4.0)
- State area, land and water (Gazetteer Files 2025) · US Census Bureau (public domain)
- Country population (SP.POP.TOTL), 2025 · World Bank (CC BY 4.0)
- Population estimates, Vintage 2025 · US Census Bureau (public domain)