The calculated distance (air line) between Berkel en Rodenrijs and Alkmaar is approximately 46 miles respectively 73 kilometers.
By car or train, the actual journey to Alkmaar is certainly longer, as only the direct route (as the crow flies) between Berkel en Rodenrijs and Alkmaar has been calculated here.
Air line (approximately)
73 kilometers
40 nautical miles