Dayton is about 2.1 times smaller than Munich.

Munich is approximately 311 sq km, while Dayton is approximately 145 sq km, making Dayton 46.52% the size of Munich.
Tip: This to-scale comparison of Munich vs. Dayton 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.