1 Gallon [Fluid, US] = 0.00378541178 Cubic Meters
1 Gallon [Dry, US] = 0.00440488 Cubic Meters
1 Gallon [UK] = 0.004546 Cubic Meters
Gallon is an imperial and US Customary volume unit. There is one type of gallon in imperial system and 2 types (liquid and dry) in US Customary system. It is widely used in daily life, such as measuring the fuel efficiency as miles per gallon, etc. The abbreviation is "gal".
Cubic meter is a metric unit and defined as a cube with sides are one meter in length. The abbreviation is "m3".