The calculated distance (air line) between Karaj and Naz̧arābād is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Naz̧arābād is certainly longer, as only the direct route (as the crow flies) between Karaj and Naz̧arābād has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles