Australia is about 20 times bigger than Japan.

Japan is approximately 377,915 sq km, while Australia is approximately 7,741,220 sq km, making Australia 1,948% larger than Japan. Meanwhile, the population of Japan is ~124.2 million people (98.1 million fewer people live in Australia).
This to-scale comparison of Japan vs. Australia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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