There are 4 quarts in a gallon. A quart is a unit of volume that is equal to approximately 0.946 liters, while a gallon is a unit of volume that is equal to approximately 3.785 liters. The relationship between quarts and gallons is fixed, with 1 gallon being equal to 4 quarts. This means that if you have 1 gallon of a substance, it is equivalent to 4 quarts of the same substance. The gallon is a standard unit of measurement used in the United States, while the quart is also used in the United States and in other parts of the world. In the metric system, the liter is used as a unit of volume, with 1 liter being equivalent to approximately 1.06 quarts.