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