Four quarts is a measure of volume that is equivalent to one gallon. There are many synonyms for this unit of measurement, including four liters, 128 fluid ounces, and 16 cups. In cooking, four quarts is a common measurement for recipes that require a large quantity of liquids, such as soups, stews, and broths. Outside of the kitchen, four quarts may be used to measure the capacity of containers, such as fuel tanks, water jugs, and milk bottles. Regardless of the context, four quarts is a valuable measurement tool that can help individuals accurately measure and distribute liquids.