Stockholm is about 8 times bigger than Sydney.

Sydney is approximately 27 sq km, while Stockholm (map shows its 47 named neighbourhoods; the area covers the whole city) is approximately 207 sq km, making Stockholm 677% larger than Sydney.
Tip: This to-scale comparison of Sydney vs. Stockholm uses the Mercator projection, which distorts the size of regions near the poles.
Our free app, MapSize by MyLifeElsewhere — compare any two places, to scale on your mobile device.