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