Christmas Island is about 57,342 times smaller than Australia.

Australia is approximately 7,741,220 sq km, while Christmas Island is approximately 135 sq km, making Christmas Island 0.0% the size of Australia. Meanwhile, the population of Australia is ~26.1 million people (26.1 million fewer people live in Christmas Island).
This to-scale comparison of Australia vs. Christmas Island uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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