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