The liter (L) is the most widely used metric unit of volume, equal to 1,000 cubic centimeters or one cubic decimeter, serving as the standard for beverages, fuel, and household liquids worldwide. Gasoline prices, bottled water, and milk cartons all reference liters in most countries. One liter equals approximately 1.0567 US quarts or 0.2642 US gallons.

The US quart (qt) is an imperial volume unit equal to one-quarter of a US gallon or exactly 0.9464 liters, commonly used in American cooking and grocery packaging. Motor oil containers and ice cream tubs in the United States frequently use quart measurements. One US quart equals exactly 2 US pints or roughly 32 US fluid ounces.