Mega-electron volts to kilojoules converter above calculates how many kilojoules are in 'X' mega-electron volts (where 'X' is the number of mega-electron volts to convert to kilojoules). In order to convert a value from mega-electron volts to kilojoules (from MeV to kJ) simply type the number of MeV to be converted to kJ and then click on the 'convert' button.