1 US Fluid Gallon = 0.133680556 Cubic Feet
1 US Dry Gallon = 0.155557003 Cubic Feet
1 Imperial Gallon = 0.160543653 Cubic Feet
Gallon is an imperial and US Customary unit. There is one type of gallon in imperial system and 2 types (liquid and dry) in US Customary system. The abbreviation is "gal".
Cubic foot is an imperial, US Customary unit and defined as a cube with sides are one foot in length. The abbreviations are "cu ft" and "ft3".