Italy is about 1.2 times bigger than United Kingdom.

United Kingdom is approximately 243,610 sq km, while Italy is approximately 301,340 sq km, making Italy 24% larger than United Kingdom. Meanwhile, the population of United Kingdom is ~69.5 million people (10.6 million fewer people live in Italy).
Tip: This to-scale comparison of United Kingdom vs. Italy uses the Mercator projection, which distorts the size of regions near the poles.
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