What is the weight of a full 5 gallon bucket?

5 UK Gallons is equivalent to 22.75 litres. (1 UK Gallon = 4.54 Litres)

5 US Gallons is equivalent to 18.93 litres. (1 US Gallon = 3.7854 Litres)

One litre of water = 1 kg (2.205 lbs), at sea level, pure water at 4 degrees C, so:

5 UK Gallons = 22.70 kg (50.05 lbs)

5 US Gallons = 18.93 kg (41.73 lbs)

So the answer is either 50.05 lbs or 41.73 lbs, depending on whether you are using UK or US Gallons, respectively.