Kilojoules and kilowatt-hours are both units of energy. One kilowatt-hour is equal to 3,600,000 joules. One kilojoule is equal to 1000 joules, so there are 3,600 kilojoules in one kilowatt-hour. The conversion value for kilojoules to kilowatt-hours is 3,600.
To convert kilojoules to kilowatt hours, divide the number of kilojoules by 3,600. For example: 7200 kilojoules / 3,600 = 2.
The last step is to label the answer with the correct unit of energy. Continuing with the example, 7200 kilojoules equals 2 kilowatt-hours.