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To convert US gallons to liters, multiply by 3.78541. So 5 gallons = 18.927 L, 10 gallons = 37.854 L, and 55 gallons (a standard drum) = 208.2 L. If dealing with UK imperial gallons, multiply by 4.54609 instead — the difference is about 20%.
Milk in the US is sold by the gallon — a common grocery staple at 3.785 L. The same quantity in Europe is sold as a 4-liter bottle. Recipe scaling, food production, and beverage manufacturing all require accurate liter equivalents when working with American gallon-based quantities.
Did you know? "Gallon" comes from the Old French "galon" and Latin "galeta" (bucket). Before the 1824 Imperial Weights and Measures Act, Britain had multiple gallon standards for wine, ale, corn, and other goods — which is why the US and UK gallons differ today.
US recipes for large-batch cooking or brewing specify liquid quantities in gallons, which European cooks need in liters. Fuel efficiency comparisons between US cars (mpg) and European cars (L/100 km) require converting gallons. Industrial chemicals and agricultural products imported from the US list volumes in gallons.