Water Weight Calculator

How much does water weigh? This calculator will determine the weight of a certain volume of water in U.S. customary units.
1 Gallon of Water Weighs
8.330 pounds
8 pounds, 5.29 ounces
133.3 ounces
3.779 kilograms
rounded to 4 digits
assuming water at 20° Celsius
Note on Units
This calculator uses United States customary units which are different from the Imperial units used in the United Kingdom.
Density of Water
This calculator uses the density of water at 20° Celsius, which is 0.9982071 grams per cubic centimeter. The weight of a certain volume of water could vary slightly depending on the temperature.