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