The US gallon is divided into two types: the liquid gallon and the dry gallon. The US liquid gallon is used for measuring fluid volumes, while the US dry gallon is used for measuring dry goods. One US liquid gallon is equal to 3.785 liters, while one US dry gallon is equal to 4.4 liters. This means that the US dry gallon is about 20% larger than the US liquid gallon.