Sydney is about 8 times smaller than Baltimore.

Baltimore is approximately 210 sq km, while Sydney is approximately 27 sq km, making Sydney 12.74% the size of Baltimore.
Tip: This to-scale comparison of Baltimore 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.