A U.S. quart is slightly smaller than a liter. One liter equals approximately 1.06 U.S. quarts. Another way to express the relationship between the quart and the liter is to say that 1 quart equals 0.946 liter.
One quart equals 2 pints or 4 cups. The cup, pint and quart are all customary units of volume and have been derived from the imperial system of measurement. This system is used primarily in the United States. A liter is a common unit of volume in the metric system, the system of measurement used in the rest of the industrialized nations. It is based on units of 10.