Divide the number of kilowatt hours by 1 million to convert to gigawatt hours. For example, if you have 5,900,000 kWh, divide 5,900,000 by 1,000,000 to get 5.9 GWh.
Multiply the number of kilowatt hours by 0.000001 to convert to gigawatt hours. In this example, you will multiply 5,900,000 by 0.000001 to get 5.9 GWh.
Check your answer with an online kilowatt hour-to-gigawatt hour converter. Enter the number of kilowatt hours and press "Convert."