Aquarium Volume Calculator

Find a rectangular aquarium's water volume.

Length

Width

Height

Volume 50.494

Volume 191.14

Formula: gallons = L × W × H ÷ 231

Step-by-step with your numbers:

1. Values used:

2. Length = 36

3. Width = 18

4. Height = 18

6. Volume = 50.494

7. Volume = 191.14

Did we solve your problem today?

Find how much water a rectangular fish tank holds.

The math behind it

gallons = length × width × height (in) ÷ 231 (cubic inches per gallon).

36×18×18 in → ~50.5 gallons.

Actual water?

Subtract a little for gravel, décor and the gap below the rim.