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Best Answer: Gallon is a unit of volume, Kg is a unit of weight (mass). Considering a liter weighing 1 Kg (water for instance), then a gallon weighs 3.7854118 Kg. To expand upon Robert's answer... A kilogram is a mass; a gallon is a volume - to convert between the two you need to know the density of the liquid. Then, you can take 1 gallon, multiply by density (make sure it's in the form kg/gallon - you may need to do some conversions) and you'll get mass. anonymous Â· 9 years ago.
Gallons measure volume and grams measure mass (weight, in common parlance) so they're not interchangeable. It's a bit like asking what your height is in pounds. Water (the usual standard) weighs 1 kilogram per liter so a gallon, which is about 3.78 liters, would weigh 3780 gm. However a gallon of cooking oil would weigh less because it's less dense, while a gallon of mercury would weigh a heck of a lot more. 10 people found this useful.