Why the distinction matters
US liquid quart and Imperial fluid ounce 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 qt = 33.3069673852 imp fl oz · 10 US qt = 333.069673852 imp fl oz.
33.3069673852 imp fl oz