The calculated distance (air line) between Calderara di Reno and San Pietro in Casale is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to San Pietro in Casale is certainly longer, as only the direct route (as the crow flies) between Calderara di Reno and San Pietro in Casale has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles