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