The calculated distance (air line) between Pforzheim and Vaihingen an der Enz is approximately 12 miles respectively 20 kilometers.
By car or train, the actual journey to Vaihingen an der Enz is certainly longer, as only the direct route (as the crow flies) between Pforzheim and Vaihingen an der Enz has been calculated here.
Air line (approximately)
20 kilometers
11 nautical miles