Sydney is about 8 times smaller than Stockholm.

Stockholm (map shows its 47 named neighbourhoods; the area covers the whole city) is approximately 207 sq km, while Sydney is approximately 27 sq km, making Sydney 12.87% the size of Stockholm.
Tip: This to-scale comparison of Stockholm vs. Sydney 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.