Firkins to fluid ounces (US labeling) converter above calculates how many fluid ounces (US labeling) are in 'X' firkins (where 'X' is the number of firkins to convert to fluid ounces (US labeling)). In order to convert a value from firkins to fluid ounces (US labeling) just type the number of firkins to be converted to fl oz and then click on the 'convert' button.