- 1). Measure the length, depth and height of the tank in inches and write the measurements down. You will use these measurements to determine your aquarium's capacity.
- 2). Multiply the three measurements from Step 1. The product is your aquarium's cubic area in inches.
- 3). Multiply the cubic area of your aquarium that you found in Step 2 by 0.00433. The result is your aquarium's capacity in gallons.
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