Megajoule Petajoule BTUCalorieERGeVFoot-poundGasolineGigajouleHorsepower HourInch-poundJouleKilojouleKilocalorieKilowatt HourMegajoulePetajouleTerajouleThermWatt SecondWh BTUCalorieERGeVFoot-poundGasolineGigajouleHorsepower HourInch-poundJouleKilojouleKilocalorieKilowatt HourMegajoulePetajouleTerajouleThermWatt SecondWh How many Petajoules in a Megajoule? 1 Megajoule equals to 1e-9 Petajoules