The calculated distance (air line) between Livorno and Castelfranco di Sotto is approximately 24 miles respectively 38 kilometers.
By car or train, the actual journey to Castelfranco di Sotto is certainly longer, as only the direct route (as the crow flies) between Livorno and Castelfranco di Sotto has been calculated here.
Air line (approximately)
38 kilometers
21 nautical miles