Kilo-electron volts to nanojoules conversion calculator above calculates how many nanojoules are in 'X' kilo-electron volts (where 'X' is the number of kilo-electron volts to convert to nanojoules). In order to convert a value from kilo-electron volts to nanojoules (from keV to nJ) type the number of keV to be converted to nJ and then click on the 'convert' button.