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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.
One US gallon of water weighs about 8.35 pounds. AnswerWater weighs 1000 kilograms per cubic meter when it's a liquid at 4 Â°C. That's 1 gram per cubic centimeter. There are 3 â¦ 785.41178 cubic centimeters per U.S. gallon.That's 3785.41178 grams per gallon, or 3.78541178 kilograms per U.S. gallon.That's about 8.3454 pounds per U.S. gallon.   AnswerOne wine measure or US gallon of water weighs 8.34 pounds. An Imperial Gallon is ten pounds of water at 62 Â°F and 30 inches of mercury air pressure.his depends on the material in the gallons. 40 pounds of water is about 5 gallons. 40 pounds of gasoline is about 7 gallons. 40 pounds of air is ... a lot of gallons.