Water Weight Calculator
How much does water weigh? One US gallon is 8.34 pounds, one liter is exactly one kilogram, and one cubic foot is 62.4 pounds. Enter any volume to get its weight.
Type a number and the answer appears straight away.
Your answer
1 gallon =8.345 lb
- Density used
- 1 g/mL
The math behind it: Water Weight
weight = volume x 1 kg per liter
The figures assume fresh water near room temperature. Water is densest at 4 °C and expands slightly as it warms, so hot water weighs a fraction less per gallon. Seawater is about 2.5% heavier.
Common questions
How much does a 5-gallon jug of water weigh?
About 41.7 pounds (18.9 kg), not counting the container.
You might also need
Checked and updated: