Pittsburgh is about 2.9 times smaller than Vienna.

Vienna is approximately 415 sq km, while Pittsburgh is approximately 143 sq km, making Pittsburgh 34.58% the size of Vienna.
Tip: This to-scale comparison of Vienna vs. Pittsburgh 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.