This aquarium volume calculator is pretty straight forward, just input your measurements and acquire results of your aquarium’s water capacity in US Gallons. This will give a rough estimate of your aquarium tank size. If you’re looking for standard aquarium sizes based on dimensions, follow this link. There are instructions below if needed.

Rectangle Aquarium Volume Calculator

If your aquarium is in the shape of a rectangle, the prompt will ask you to provide the length, width, and height in inches. Doing so will provide a rough estimate of how much water volume is in your fish tank in US gallons. Amount of gallons may differ depending on the amount of gravel and decorations in the fish tank.

Cylinder Volume Calculator

If your fish tank is in the shape of a cylinder, which is quite common for vases and jars, this will help you calculate the volume of the enclosure. The prompt will ask you to provide your height and diameter in inches, of the cylindrical aquarium. The result will be the volume of your aquarium in US gallons. Actual volume may differ depending on decorations and gravel present in the fish tank.