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