The calculated distance (air line) between Nay Pyi Taw and Loikaw is approximately 70 miles respectively 113 kilometers.
By car or train, the actual journey to Loikaw is certainly longer, as only the direct route (as the crow flies) between Nay Pyi Taw and Loikaw has been calculated here.
Air line (approximately)
113 kilometers
61 nautical miles