how much does 5 gallons of water weigh

A US gallon of water weighs about 8.34 pounds (3.78 kilograms) at around 62 °F (17 °C). The exact weight can vary slightly depending on the water temperature because cold water is denser than warm water. For example, at 39.2 °F (4 °C), a gallon of water weighs approximately 8.345 pounds. In the UK, an imperial gallon of water weighs about 10.02 pounds (4.546 kilograms) at its most dense temperature. So, for general everyday use, you can consider the weight of one US gallon of water to be approximately 8.34 pounds.