Weight of 1 US Gallon of water = approx. 8.35 lb (about 3.785 kg)
Weight of 1 Imperial gallon (i.e. UK measure) of water weighs 10 pounds (4.536 kg) by definition, at a specified temperature and pressure.
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About 8.35 pounds or 3.8 (3.787496) kilograms.
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An Imperial gallon of water has the mass 4,54609 kg.
Both are non-SI units and may create confusion.
A gallon of water weighs about 8 pounds.1000 g/liter
453.592 g/lb
3.78541 liters/gallon
so
8.345 lb/gallon of water
A gallon of water weighs approximately 8.34 pounds.
A gallon of water weighs about 8.34 pounds. So, a 50 gallon water heater full of water would weigh approximately 417 pounds.
A gallon of water weighs approximately 8.34 pounds.
The weight of water is approximately 8.34 pounds per gallon. So, 400 gallons of water would weigh around 3,336 pounds.
A gallon of water weights 8 pounds. It can vary a bit according to temperature.