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1 Gallon =

3.7854118 Liters

(rounded to 8 digits)

A U.S. gallon is a unit of volume equal to 128 U.S. fluid ounces, or about 3.785 liters. It should not be confused with the imperial gallon used in the United Kingdom.

A liter, or litre, is a unit of volume in the metric system. A liter is defined as the volume of a cube that is 10 centimeters on a side. There are about 3.785 liters in a U.S. gallon.