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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.
Pounds into Gallons: Multiply the specific gravity of the liquid by 8.33* (weight in pounds of 1 gallon of water); then divide the number of pounds by the result, to obtain the volume in gallons. Milliliters into Grams: Multiply the specific gravity of the substance by the number of milliliters, to obtain the weight in grams.