The calculated distance (air line) between Zimmern ob Rottweil and Karlsruhe is approximately 59 miles respectively 95 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Zimmern ob Rottweil and Karlsruhe has been calculated here.
Air line (approximately)
95 kilometers
51 nautical miles