How to Convert Joules
- 1). Divide 1 joule by 3600 as there are 3600 seconds in an hour.
- 2). Divide your answer by 1000 as there are a thousand watts in a kilowatt. The number that you should get is 2.77777777778*10^-7 (which is also written as .000000277777777778).
- 3). Multiply the number of Joules you are converting by 2.77777777778*10^-7. This is now stated in kilowatt-hours instead of joules.
Source...