Calories (15 °C) to kilowatt hours conversion calculator above calculates how many kilowatt hours are in 'X' calories (15 °C) (where 'X' is the number of calories (15 °C) to convert to kilowatt hours). In order to convert a value from calories (15 °C) to kilowatt hours (from cal to kWh) just type the number of cal to be converted to kWh and then click on the 'convert' button.