Australia is about 1.3 times smaller than United States.

United States is approximately 9,833,517 sq km, while Australia is approximately 7,741,220 sq km, making Australia 78.72% the size of United States. Meanwhile, the population of United States is ~337.3 million people (311.2 million fewer people live in Australia).
This to-scale comparison of United States vs. Australia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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