Atlanta is about 1.6 times bigger than Chemnitz.

Chemnitz is approximately 221 sq km, while Atlanta (map shows its 114 named neighbourhoods; the area covers the whole city) is approximately 350 sq km, making Atlanta 59% larger than Chemnitz.
Tip: This to-scale comparison of Chemnitz vs. Atlanta 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.