Gigajoule Kilowatt Hour BTUCalorieERGeVFoot-poundGasolineGigajouleHorsepower HourInch-poundJouleKilojouleKilocalorieKilowatt HourMegajoulePetajouleTerajouleThermWatt SecondWh BTUCalorieERGeVFoot-poundGasolineGigajouleHorsepower HourInch-poundJouleKilojouleKilocalorieKilowatt HourMegajoulePetajouleTerajouleThermWatt SecondWh How many Kilowatt Hours in a Gigajoule? 1 Gigajoule equals to 277.77777777777777 Kilowatt Hours Reserved Space