The calculated distance (air line) between Dallgow-Döberitz and Potsdam is approximately 10 miles respectively 16 kilometers.
By car or train, the actual journey to Potsdam is certainly longer, as only the direct route (as the crow flies) between Dallgow-Döberitz and Potsdam has been calculated here.
Air line (approximately)
16 kilometers
9 nautical miles