Queensland is about 1.5 times smaller than Western Australia.

Western Australia is approximately 2,527,013 km² (975,685 sq mi), while Queensland is approximately 1,729,742 km² (667,857 sq mi), making Queensland 68.45% the size of Western Australia.
Tip: This to-scale comparison of Western Australia vs. Queensland uses the Mercator projection, which distorts the size of regions near the poles.
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