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

1. Volume of your hexagon tank
2. Surface area of your hexagon tank
3. How Many Fish your hexagon 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. Units

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 caluclate 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.

Hexagon Aquarium Fish Tank

Check prices for Hexagon Aquariums

Fishkeeper Essentials

Consider these items we use or personally recommend for setting up and maintaining a new aquarium tank. Links go to Amazon.com.

Python Fish Tank Siphon Python You need this. Get one now!
Water Test Kit Water Test Kit. Fresh test kits are critical for a new tank. I lost some new fish in a quarantine tank when I missed an ammonia spike due to outdated testing supplies.
Bio-wheel Filter
Bio-Wheel Filters. I use a "bio-wheel" filter (there are several brands that use them); it's been quiet and trouble-free.
Acrylic Fish Tank Aquarium 20 Gallon Tank or Larger. Bigger is better in fish tanks. Larger aquariums are more stable and hold more fish properly. Many people buy a small tank, cram it full of fish, then wonder why the fish keep dying. The care of a 20 gallon aquairum is not much more a 5 or 10 gallon once set up. The tank pictured is acrylic; glass tanks don't ship well if you are ordering online.
Sinking Driftwood
Sinking Driftwood I prefer the look of real wood over artificial plastic aquarium decorations. Always soak it for a few weeks before putting this in your tank to minimize coloring the water. The color will not hurt the fish, though. Wood purchased from suppliers is free of dirt and contaminants possibly found in driftwood you might harvest yourself.
Aquarium Light Replacement Bulb
Got Light? I have a planted tank, and planted aquariums need lots of light. Fluorescent bulbs dim over time, so its best to replace them every 6 months or so for maximum benefit.