BTU (IT) per hour to kilocalories per second conversion calculator shown above calculates how many kilocalories per second are in 'X' BTU (IT) per hour (where 'X' is the number of BTU (IT) per hour to convert to kilocalories per second). In order to convert a value from BTU (IT) per hour to kilocalories per second (from BTU/h to kcal/s) just type the number of BTU/h to be converted to kcal/s and then click on the 'convert' button.