Sydney is about 4.3 times smaller than Eugene.

Eugene is approximately 115 sq km, while Sydney is approximately 27 sq km, making Sydney 23.17% the size of Eugene.
Tip: This to-scale comparison of Eugene 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.