The calculated distance (air line) between Pforzheim and Limburg an der Lahn is approximately 108 miles respectively 173 kilometers.
By car or train, the actual journey to Limburg an der Lahn is certainly longer, as only the direct route (as the crow flies) between Pforzheim and Limburg an der Lahn has been calculated here.
Air line (approximately)
173 kilometers
93 nautical miles