Sydney is about 7 times bigger than Budapest.

Budapest is approximately 525 sq km, while Sydney (the 30 councils of metropolitan Sydney, without the Blue Mountains, Hawkesbury, Wollondilly and the Central Coast) is approximately 3,810 sq km, making Sydney 625% larger than Budapest.
Tip: This to-scale comparison of Budapest vs. Sydney uses the Mercator projection, which distorts the size of regions near the poles.
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