Enter the volume and density into the calculator to determine the weight of the fish tank. This calculator can also evaluate any of the variables given the others are known.

Fish Tank Weight Formula

The following formula is used to calculate the weight of a fish tank.

WT = V * D

Variables:

  • WT is the weight of the fish tank (kg) V is the volume of the fish tank (liters) D is the density of the water (kg/liter)

To calculate the weight of a fish tank, multiply the volume of the fish tank by the density of the water. The result will be the weight of the fish tank.

What is a Fish Tank Weight?

A fish tank weight refers to the total mass of a fish tank when it is filled with water, gravel, decorations, and fish. This weight is crucial to consider when placing a fish tank in a home or building, as the structure must be able to support this weight. The weight can vary greatly depending on the size of the tank and the materials used within it.

How to Calculate Fish Tank Weight?

The following steps outline how to calculate the Fish Tank Weight.


  1. First, determine the volume of the fish tank (V) in liters.
  2. Next, determine the density of the water (D) in kg/liter.
  3. Next, gather the formula from above = WT = V * D.
  4. Finally, calculate the Fish Tank Weight (WT) in kg.
  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.

volume of the fish tank (V) = 50 liters

density of the water (D) = 1.2 kg/liter