Calories per second to kilowatts conversion calculator shown above calculates how many kilowatts are in 'X' calories per second (where 'X' is the number of calories per second to convert to kilowatts). In order to convert a value from calories per second to kilowatts (from cal/s to kW) just type the number of cal/s to be converted to kW and then click on the 'convert' button.