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