Knots to nautical miles per day converter above calculates how many nautical miles per day are in 'X' knots (where 'X' is the number of knots to convert to nautical miles per day). In order to convert a value from knots to nautical miles per day (from kn to nmi/d) simply type the number of kn to be converted to nmi/d and then click on the 'convert' button.