Question 1

How is aquarium water volume calculated?

Accepted Answer

By applying geometric volume formulas for the chosen tank shape and converting to gallons/liters.

Question 2

How many gallons are in a cubic foot of water?

Accepted Answer

About 7.48 US gallons per cubic foot (8.34 lb per US gallon).

Question 3

Should I include substrate and decorations?

Accepted Answer

For water volume, subtract displacement from rocks, substrate, and equipment; the calculator estimates filled depth.

Question 4

Why is filled depth important?

Accepted Answer

Most tanks aren’t filled to the brim; using fill height gives a more accurate water volume and dosing basis.

Question 5

Is the weight estimate safe for furniture?

Accepted Answer

Use it as a screening value; always check manufacturer load ratings and consider dynamic loads.

Aquarium Volume Calculator