Foot-pounds force to British thermal units (IT) conversion calculator shown above calculates how many British thermal units (IT) are in 'X' foot-pounds force (where 'X' is the number of foot-pounds force to convert to British thermal units (IT)). In order to convert a value from foot-pounds force to British thermal units (IT) (from ft lbf to BTU) just type the number of ft lbf to be converted to BTU and then click on the 'convert' button.