The calculated distance (air line) between Berkel en Rodenrijs and Zaanstad is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Zaanstad is certainly longer, as only the direct route (as the crow flies) between Berkel en Rodenrijs and Zaanstad has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles