The calculated distance (air line) between Louvres and Paris 13 Gobelins is approximately 16 miles respectively 26 kilometers.
By car or train, the actual journey to Paris 13 Gobelins is certainly longer, as only the direct route (as the crow flies) between Louvres and Paris 13 Gobelins has been calculated here.
Air line (approximately)
26 kilometers
14 nautical miles