Enter the volume of water in gallons into the calculator to determine the weight of the water in pounds. This calculator assumes the density of water is 8.34 pounds per gallon.

Water Weight Per Gallon Formula

The following formula is used to calculate the weight of water per gallon.

WW = V * 8.34

Variables:

  • WW is the water weight (pounds)
  • V is the volume of water (gallons)

To calculate the weight of water per gallon, multiply the volume of water in gallons by the weight of one gallon of water, which is approximately 8.34 pounds.

What is Water Weight Per Gallon?

Water weight per gallon is a measure of the weight of water per unit volume. It is a useful calculation for various applications, including water treatment, aquariums, and when dealing with large quantities of water where weight is a concern. The weight of water can vary slightly depending on temperature and impurities, but for most practical purposes, it is taken as 8.34 pounds per gallon at room temperature.

How to Calculate Water Weight Per Gallon?

The following steps outline how to calculate the Water Weight Per Gallon.


  1. First, determine the volume of water (V) in gallons.
  2. Next, use the formula WW = V * 8.34 to calculate the water weight (WW) in pounds.
  3. Finally, enter the volume into the calculator above to get the weight of the water.

Example Problem :

Use the following variables as an example problem to test your knowledge.

Volume of water (V) = 50 gallons

The weight of the water (WW) is calculated as follows:

WW = 50 * 8.34 = 417 pounds