The calculated distance (air line) between Rothenburg ob der Tauber and Nürnberg is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Nürnberg is certainly longer, as only the direct route (as the crow flies) between Rothenburg ob der Tauber and Nürnberg has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles