Sydney is about 2.1 times smaller than Chapel Hill.

Chapel Hill is approximately 56 sq km, while Sydney is approximately 27 sq km, making Sydney 47.52% the size of Chapel Hill.
Tip: This to-scale comparison of Chapel Hill 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.