The calculated distance (air line) between Nay Pyi Taw and Taungdwingyi is approximately 42 miles respectively 68 kilometers.
By car or train, the actual journey to Taungdwingyi is certainly longer, as only the direct route (as the crow flies) between Nay Pyi Taw and Taungdwingyi has been calculated here.
Air line (approximately)
68 kilometers
37 nautical miles