Kilocalories per day to foot-pound-force per second conversion calculator shown above calculates how many foot-pound-force per second are in 'X' kilocalories per day (where 'X' is the number of kilocalories per day to convert to foot-pound-force per second). In order to convert a value from kilocalories per day to foot-pound-force per second (from kcal/d to ft lbf/s) just type the number of kcal/d to be converted to ft lbf/s and then click on the 'convert' button.