Things You'll Need
- Tape measure
Instructions
Measure from the bottom of the fish tank to the top. This is the height. For example, a fish tank might have a height of one and a half feet.
Measure from the front of the fish tank to the back of the fish tank. This is the width of the fish tank. For example, a fish tank could have a width of one foot.
Measure across the front of the fish tank. This is the length of the fish tank. For example, a fish tank might have a length of four feet.
Multiply the height by the length by the width. In the example, multiply 1.5 feet by one foot by four feet, which equals a volume of six cubic feet.
Multiply the cubic feet by 7.48051948. In the example, six cubic feet times 7.48051948 equals 44.8831169 gallons.