The calculated distance (air line) between Niefern-Öschelbronn and Calw is approximately 14 miles respectively 23 kilometers.
By car or train, the actual journey to Calw is certainly longer, as only the direct route (as the crow flies) between Niefern-Öschelbronn and Calw has been calculated here.
Air line (approximately)
23 kilometers
12 nautical miles