Guam is about 448 times smaller than United Kingdom.

United Kingdom is approximately 243,610 sq km, while Guam is approximately 544 sq km, making Guam 0.22% the size of United Kingdom. Meanwhile, the population of United Kingdom is ~67.8 million people (67.6 million fewer people live in Guam).
This to-scale comparison of United Kingdom vs. Guam uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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