8420000 joules equals 8.42 megajoules.
Convert 8420000 joules into kilojoules, calories, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...
Convert 9 megajoules into kilojoules, calories, newton meters, foot pounds, watt hours, kilowatt hours, megawatt hours, mega electrons, etc...