Sydney is about 18 times smaller than Albuquerque.

Albuquerque (map shows its 231 named neighbourhoods; the area covers the whole city) is approximately 485 sq km, while Sydney is approximately 27 sq km, making Sydney 5.51% the size of Albuquerque.
Tip: This to-scale comparison of Albuquerque 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.