Sydney is about 18 times smaller than Scottsdale.

Scottsdale is approximately 477 sq km, while Sydney is approximately 27 sq km, making Sydney 5.6% the size of Scottsdale.
Tip: This to-scale comparison of Scottsdale 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.