Pardon the dust. We are remodeling. The calculators still work in the meantime. Enjoy!

Welcome to our Hexagon Aquarium Tools. You can calculate three things here:

1. Volume of your hexagonal fish tank
2. Surface area of your hexagon tank
3. How Many Fish your hex tank can support

Hex calculators available in U.S. and metric units.

1. Calculate Volume of a Hexagon Tank

Enter the width of one side and the height of a hexagonal aquarium to see the volume of your hexagon aquarium

U.S. Unit Calculator

Width of one side: Inches
Height: Inches
Volume Gallons

Metric

Width of one side cm
Height cm
Volume Litres

2. Calculate Surface Area of Hexagon Tank

Enter the width of one side, in any units, of a hexagon aquarium to see the surface area of the aquarium.

This calculator will tell you how much surface area you have on the top of the hex aquarium, where gas exchange takes place. Whatever units you enter, the result will be in square units. For example, if you input inches, the result will give you square inches.

Width of one side: Units
Area Square Units

3. Calculate Fish Capacity of Hexagon Tank

Enter the surface area of your hexagon aquarium to estimate how many inches of fish your hexagon aquarium can support.

The surface area can be used to calculate how many fish your tank can support. Generally, the tall, narrow format of a hexagonal aquarium tank will not support as many fish as a traditional wide-format rectangular tank. This is because the rate that oxygen can diffuse into the water is limited by the surface area. Check our How Many Fish? home page for the complete explanation behind these figures.

U.S. Units

Enter Surface Area (inches):
Maximum inches of slender fish your tropical freshwater tank can support:
Maximum inches of heavy-bodied fish your tropical freshwater tank can support:
Maximum inches of fish your
cold freshwater tank can support:
Maximum inches of fish your
salt water tank can support:
Explanation of Results

Metric

Enter Surface Area (cm):
Maximum cm of slender fish your
tropical freshwater tank can support:
Maximum cm of heavy-bodied fish your
tropical freshwater tank can support:
Maximum cm of fish your
cold freshwater tank can support:
Maximum cm of fish your
salt water tank can support:
Explanation of Results

Do you know about cycling a new aquarium? The biggest mistake made by people setting up their first fish tank is to not understand the concept of cycling. Learn more here on our Aquarium Cycling page.