Why the distinction matters
US fluid ounce and millilitre belong to measurement conventions that may look familiar but are not always equivalent across countries. Mendeleev.com therefore keeps the system name next to the abbreviation and calculates from defined conversion factors rather than rounded kitchen rules.
Example
1 US fl oz = 29.5735295625 mL · 10 US fl oz = 295.735295625 mL.
29.5735295625 mL