1 Cubic Inch (in3) = 0.00432900433 Gallons [Fluid, US]
1 Cubic Inch (in3) = 0.00372020347 Gallons [Dry, US]
1 Cubic Inch (in3) = 0.00360465014 Gallons [UK]
Cubic inch is an imperial, US Customary unit and defined as a cube with sides are one inch in length. The abbreviation is "in3".
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".