Vienna is about 2.3 times bigger than Brooklyn.

Brooklyn is approximately 180 sq km, while Vienna is approximately 415 sq km, making Vienna 131% larger than Brooklyn.
Tip: This to-scale comparison of Brooklyn vs. Vienna 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.