Nautical miles per hour to feet per second conversion calculator shown above calculates how many feet per second are in 'X' nautical miles per hour (where 'X' is the number of nautical miles per hour to convert to feet per second). In order to convert a value from nautical miles per hour to feet per second (from nmi/h to ft/s) just type the number of nmi/h to be converted to ft/s and then click on the 'convert' button.