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