Calgary is about 11,911 times smaller than United States.

United States is approximately 9,833,517 sq km, while Calgary (map shows its 242 named neighbourhoods; the area covers the whole city) is approximately 826 sq km, making Calgary 0.01% the size of United States.
Tip: This to-scale comparison of United States vs. Calgary uses the Mercator projection, which distorts the size of regions near the poles.
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