The calculated distance (air line) between Bad Münder am Deister and Hamburg-Mitte is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Hamburg-Mitte is certainly longer, as only the direct route (as the crow flies) between Bad Münder am Deister and Hamburg-Mitte has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles