A quart is a unit of liquid volume in the US customary system that is equal to one-quarter of a gallon, or two pints. In precise scientific terms, a US liquid quart is approximately 946.35 milliliters, which is just slightly less than a full liter (1,000 ml). It is also equivalent to 32 fluid ounces or 4 cups. In the United Kingdom and some Commonwealth nations, the "Imperial quart" is used, which is slightly larger at approximately 1,136.52 milliliters (or 40 imperial fluid ounces). For everyday practical use in 2026, you can think of a quart as roughly the size of a standard large carton of milk or a professional-sized bottle of Gatorade. When cooking or following recipes, knowing that 1 quart=4 cups is the most helpful conversion for ensuring accurate measurements in both domestic and professional kitchens.