Potsdam is about 3.3 times smaller than Tokyo.

Tokyo is approximately 619 sq km, while Potsdam is approximately 188 sq km, making Potsdam 30.41% the size of Tokyo.
Tip: This to-scale comparison of Tokyo vs. Potsdam 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.