The calculated distance (air line) between Königsfeld im Schwarzwald and Karlsruhe is approximately 60 miles respectively 97 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Königsfeld im Schwarzwald and Karlsruhe has been calculated here.
Air line (approximately)
97 kilometers
52 nautical miles