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