Gallon (US)
The US gallon, symbol gal, equals 4 quarts, 8 pints, or 128 fluid ounces (~3.785 liters). Its origins trace to English wine and ale measures but were standardized in the US in the 19th century. Gallons are used for beverages, fuel, and large-volume recipes. While metric liters are the dominant unit of measurement in most countries, gallons remain widely used in the United States for everyday and industrial liquid measurements.
Quart (US)
The US quart equals 2 pints or 32 fluid ounces (~946.353 milliliters). Its name derives from “quartus,” meaning one-fourth of a gallon. Quarts are used in cooking, beverage packaging, and household measures, providing a convenient medium-sized unit. The quart’s integration into the US customary system allows cooks and manufacturers to scale recipes and liquid volumes efficiently.