Use the free Aquarium Volume Calculator on ToolVexa to estimate the volume of a rectangular aquarium in US gallons from its dimensions in inches.
How to Use
Enter the tank length, width and height in inches, then press Calculate.
Formula in Plain Words
Multiply length by width by height in inches, then divide by 231, the number of cubic inches in a US gallon.
Worked Example
For a tank 36 inches by 18 inches by 24 inches, the estimated volume is 67.3 gallons.
FAQs
Is this the water volume or the tank volume?
It is the full tank volume. Substrate, decorations and a lower water level will reduce the actual water volume.
What if my tank is not rectangular?
This version is for rectangular tanks only. Bow-front and cylindrical tanks need a different formula.
Are these US gallons?
Yes. The result is in US gallons.