Fort Worth is about 4.2 times smaller than Sydney.

Sydney (the 30 councils of metropolitan Sydney, without the Blue Mountains, Hawkesbury, Wollondilly and the Central Coast) is approximately 3,810 sq km, while Fort Worth (map shows its 16 named neighbourhoods; the area covers the whole city) is approximately 911 sq km, making Fort Worth 23.93% the size of Sydney.
Tip: This to-scale comparison of Sydney vs. Fort Worth uses the Mercator projection, which distorts the size of regions near the poles.
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