Things You'll Need
- Measuring tape
Instructions
Place the empty aquarium on a sturdy stand. Measure the height of the tank by placing the measuring tape at the bottom of the aquarium and pulling it up to the top.
Measure the length and width of the tank. Write down the measurements for the height, width and length of the tank.
Enter those figures into a volume calculator, such as the one provided by the First Tank Guide. The result is the volume of your tank in both cubic inches and gallons.