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