Chicago is about 2.7 times bigger than Chemnitz.

Chemnitz is approximately 221 sq km, while Chicago is approximately 590 sq km, making Chicago 167% larger than Chemnitz.
Tip: This to-scale comparison of Chemnitz vs. Chicago 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.