United Kingdom is about 1.7 times smaller than California.

California is approximately 403,882 sq km, while United Kingdom is approximately 243,610 sq km, making United Kingdom 60.32% the size of California. Meanwhile, the population of California is ~37.3 million people (30.5 million more people live in United Kingdom).
This to-scale comparison of California vs. United Kingdom uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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