HowManyFish.com Aquarium Estimator Tools

How Big is My Hexagonal Aquarium?

Calculate volume, surface area and fish capacity of a hexagon aquarium

Welcome to our Hexagon Aquarium Tools. Here we can calculate three things about your hexagonal fish tank:

  1. Volume
  2. Surface area
  3. How Many Fish your hex tank can support

Our hex calculators are available below in U.S. and metric units. For normal, rectangular tanks, follow the menu to visit the other pages on this website.

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 Hex Volume

Width of one side: Inches
Height: Inches
Volume Gallons

Metric Hex Volume

Width of one side cm
Height cm
Volume Litres

Calculate Surface Area of Hexagon Tank

Enter the width of one side, in any unit, 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; if you put in rods, you'll get rods. If you put in astronomical units, you must have a really big tank.

Width of one side: Units
Area Square Units

Estimate 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 and frequently asked questions regarding these estimates.

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 Units

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