Gills (US) to fluid ounces (UK) conversion calculator above calculates how many fluid ounces (UK) are in 'X' gills (US) (where 'X' is the number of gills (US) to convert to fluid ounces (UK)). In order to convert a value from gills (US) to fluid ounces (UK) simply type the number of gills (US) to be converted to fl oz and then click on the 'convert' button.