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