Sydney is about 35 times smaller than Indianapolis.

Indianapolis is approximately 935 sq km, while Sydney is approximately 27 sq km, making Sydney 2.86% the size of Indianapolis.
Tip: This to-scale comparison of Indianapolis 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.