The calculated distance (air line) between Reichenbach an der Fils and Karlsruhe is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Karlsruhe is certainly longer, as only the direct route (as the crow flies) between Reichenbach an der Fils and Karlsruhe has been calculated here.
Air line (approximately)
84 kilometers
46 nautical miles