How much is 1 galleon of water?

One galleon of water is equivalent to approximately 3.785 liters or 0.992 gallons in the U.S. measurement system. In the imperial system, one galleon is about 4.546 liters or 1.201 gallons. Therefore, a galleon is a unit of volume used primarily in reference to liquids, particularly in the context of the British imperial system.