The calculated distance (air line) between Rochefort-du-Gard and Montpellier is approximately 48 miles respectively 77 kilometers.
By car or train, the actual journey to Montpellier is certainly longer, as only the direct route (as the crow flies) between Rochefort-du-Gard and Montpellier has been calculated here.
Air line (approximately)
77 kilometers
41 nautical miles