The calculated distance (air line) between Münstertal/Schwarzwald and Karlsruhe is approximately 85 miles respectively 136 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Münstertal/Schwarzwald and Karlsruhe has been calculated here.
Air line (approximately)
136 kilometers
74 nautical miles