Miles per minute to nautical miles per day conversion calculator shown above calculates how many nautical miles per day are in 'X' miles per minute (where 'X' is the number of miles per minute to convert to nautical miles per day). In order to convert a value from miles per minute to nautical miles per day (from mpm to nmi/d) type the number of mpm to be converted to nmi/d and then click on the 'convert' button.