Enter the initial and final volume of water into the calculator to determine the water loss. This calculator helps to estimate the amount of water lost due to leaks, evaporation, or other factors.

Water Loss Formula

The following formula is used to calculate the water loss.

WL = IV - FV


  • WL is the water loss (gallons)
  • IV is the initial volume of water (gallons)
  • FV is the final volume of water (gallons)

To calculate the water loss, subtract the final volume of water from the initial volume of water.

What is Water Loss?

Water loss refers to the amount of water that is lost from a system due to various reasons such as leaks, evaporation, or overflow. It is an important metric in water management for municipalities, agriculture, and any system where water conservation is important. Understanding and minimizing water loss can lead to significant cost savings and more efficient water use.

How to Calculate Water Loss?

The following steps outline how to calculate the Water Loss.

  1. First, determine the initial volume of water (IV) in gallons.
  2. Next, determine the final volume of water (FV) in gallons.
  3. Next, gather the formula from above = WL = IV – FV.
  4. Finally, calculate the Water Loss (WL) in gallons.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

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

Initial volume of water (IV) = 500 gallons

Final volume of water (FV) = 450 gallons