United Kingdom is about 1.6 times smaller than Japan.

Japan is approximately 377,915 sq km, while United Kingdom is approximately 243,610 sq km, making United Kingdom 64.46% the size of Japan. Meanwhile, the population of Japan is ~124.2 million people (56.4 million fewer people live in United Kingdom).
This to-scale comparison of Japan vs. United Kingdom uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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