Stockholm is about 8 times smaller than London.

London (including the 32 boroughs of greater London) is approximately 1,572 sq km, while Stockholm (map shows its 47 named neighbourhoods; the area covers the whole city) is approximately 207 sq km, making Stockholm 13.2% the size of London.
Tip: This to-scale comparison of London vs. Stockholm uses the Mercator projection, which distorts the size of regions near the poles.
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