The calculated distance (air line) between Roquebrune-sur-Argens and Grenoble is approximately 128 miles respectively 206 kilometers.
By car or train, the actual journey to Grenoble is certainly longer, as only the direct route (as the crow flies) between Roquebrune-sur-Argens and Grenoble has been calculated here.
Air line (approximately)
206 kilometers
111 nautical miles