Cubic feet of natural gas to British thermal units (IT) converter on this page calculates how many British thermal units (IT) are in 'X' cubic feet of natural gas (where 'X' is the number of cubic feet of natural gas to convert to British thermal units (IT)). In order to convert a value from cubic feet of natural gas to British thermal units (IT) simply type the number of cubic feet of natural gas to be converted to BTU and then click on the 'convert' button.