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