Sydney is about 3.9 times smaller than Tempe.

Tempe (map shows its 64 named neighbourhoods; the area covers the whole city) is approximately 104 sq km, while Sydney is approximately 27 sq km, making Sydney 25.78% the size of Tempe.
Tip: This to-scale comparison of Tempe 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.