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