Australia is about 19 times bigger than California.

California is approximately 403,882 sq km, while Australia is approximately 7,741,220 sq km, making Australia 1,817% larger than California. Meanwhile, the population of California is ~37.3 million people (11.1 million fewer people live in Australia).
This to-scale comparison of California vs. Australia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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