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.

!Critical Fishkeeping Equipment

Fish are not set-up-and-forget pets. Consider these items we personally use and recommend that make the setting up and maintenance of an aquarium easier for you and healthier for the fish.

Aqueon Water Changer and Gravel Cleaner
Gravel Cleaner and Water Changer

Water changes of 10-20% should be done weekly. Vacuum, empty and fill your tank quickly from any faucet with this gadget. No more buckets! Don't forget dechlorinator and a thermometer, too.

Water Parameter Test Kit for Aquarium Fish Tank
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. Liquid kits are far superior to test strips.

MarineLand BioWheel Tank Filter
Bio-Wheel Filters. The bio-wheel section maintains beneficial bacteria even when filter media is replaced. My Marineland Bio-Wheel has been quiet and trouble-free. TIP: Don't replace the filter media until it is about to fall apart. When clogged, rinse it in water removed from the tank. Over-cleaning can cause an ammonia spike.