BTU (IT) per minute to kilocalories per day conversion calculator above calculates how many kilocalories per day are in 'X' BTU (IT) per minute (where 'X' is the number of BTU (IT) per minute to convert to kilocalories per day). In order to convert a value from BTU (IT) per minute to kilocalories per day (from BTU/min to kcal/d) simply type the number of BTU/min to be converted to kcal/d and then click on the 'convert' button.