US Fluid Ounce (US Fl. oz) is a United States customary volume unit. Please don't be confused with the ounce which
is a mass unit. Similar US customary volume units include pint (16 fl. oz), quart (32 fl. oz), gallon (128 fl. oz), cup (8 fl. oz) etc. These units are slightly different from the imperial volume units with the same names. For example,
1 US Fl. oz = 1.041 UK Fl. oz.
Milliliter (ml) is a SI volume unit for scientific as well as customary use. 1 ml is 1/1000 liter.