The calculated distance (air line) between Alsbach-Hähnlein and Karlsruhe is approximately 51 miles respectively 82 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Alsbach-Hähnlein and Karlsruhe has been calculated here.
Air line (approximately)
82 kilometers
44 nautical miles