Question: what is the formula to calculate kilowatt hours?
Answer: A kilowatt-hour, expressed as kWh or kW·h, is a measure of energy that is equivalent to 1,000 watts of power for a 1 hour time period. Thus, to convert watts to kilowatt-hours, multiply the power in watts by the number of hours, then divide by 1,000. For example: let's find the kWh of 1,500 watts for 2.5 hours.