Cubic millimeters to fluid ounces (UK) conversion calculator above calculates how many fluid ounces (UK) are in 'X' cubic millimeters (where 'X' is the number of cubic millimeters to convert to fluid ounces (UK)). In order to convert a value from cubic millimeters to fluid ounces (UK) (from mm³ to fl oz) type the number of mm³ to be converted to fl oz and then click on the 'convert' button.