The calculated distance (air line) between Rochefort-du-Gard and Grenoble is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Rochefort-du-Gard and Grenoble has been calculated here.
Air line (approximately)
157 kilometers
84 nautical miles