Informative Calculators ▶ Aquarium Calculator
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Make use of this aquarium calculator that will let you calculate volume of fish tank. Yes, if you find it hard to estimate how much water you need to fill up your tank, then do not worry! Our online fish tank volume calculator will readily do this for you.
Let’s go deeper in the content below to know different shapes of the aquarium and formulas to calculate the water volume for each shape respectively.
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Aquarium volume corresponds to the volume of water that it can hold. It is basically determined by taking the following dimensions into considerations:
The online aquarium volume calculator also keeps in pace these parameters while performing aquarium volume calculations.
Basically, there are two types of volume that are described below:
This volume corresponds to the full sized capacity of the aquarium. Most of the time, the manufacturers mention this volume on every aquarium so as to easily estimate the volume of the water it can hold. For further help, you may subject the aquarium calculator to better estimate the results.
The realistic volume of the fish tank is a far better estimation to take into consideration while buying an aquarium. This volume is always less than the full capacity of the tank as it allows smooth running of the water in each and every corner and creates a healthy ecosystem for the fish.
As discussed previously, aquariums come in different shapes, sizes, and dimensions. But this aquarium dimension calculator uses different equations to calculate aquarium gallons needed to fill the box. The most in demands along with their formulas are given as under:
Rectangular = Height * Width * Length
Cube = Length^3
For a regular hexagon, each side is of the same length. So we have:
Volume = ((3*√3)/2) * Front Width² * Height
Volume = (((((3*√3)/2) * front width²)/2) + (side * length)) * height
In our fish tank calculator, you can select these two shapes separately to calculate volume of fish tank.
Volume = (2 * (front width²) * (1+√2)) * height
Aquariums come in different cylindrical patterns. For each particular one, the equation to find the volume of the water is given as below:
Cylinder = π * (Diameter / 2)^2 * Height
Half_Cylinder = π * (Diameter / 2)^2* Height / 2
Quarter_Cylinder = π * Radius² * Height / 4
We recommend you use the radius of the shape in order to make the computations faster and easier.
Diameter = 2 * Radius
To calculate volume of the bow front aquarium, you require the following dimensions:
All of these factors are covered in the following expression:
Bowfront = Height * Width * Length + 0.5 * r^2 * (α – sin(α)) * Height
Where:
Here one tricky thing that you will mostly cope with is the shape itself. In an L shaped tank, we have a couple of rectangles joined. Here, you need to calculate the area of both of these rectangles separately. After that, add the areas together and multiply the result with the height. The whole parameters are covered in the following formula that are also used by this aquarium volume calculator to determine the outputs:
Volume = ((Length 1 * Width 1) + ((Length 2 – Width 1) * Width 2)) * Height
Volume³ = 𝛑 * radius 1 * radius 2 * height
Volume = ((Length 1 * Length 2)/2) * Height
You should keep in mind that:
For instance, we have arranged tables below that are arranged properly, depending upon the quantity, weight, volume, and condition of water. Let’s look at these one by one!
SMALLSIZED AQUARIUMS 

Tank Size  L x W x H  Empty Weight  Plants & Rocks  Filled Weight Freshwater (Including Plants & Rocks)  Filled Weight Saltwater (Including Plants & Rocks) 

Inches  lbs  lbs  lbs 
lbs 
2 1/2 gallon  12″ x 6″ x 8″  3  3  26.9 
27.4 
5 gallon 
16″ x 8″ x 10″  7  10  58.7  59.8 
10 gallon “Leader”  20″ x 10″ x 12″  11  15  109.5 
111.5 
15 gallon 
24″ x 12″ x 12″  21  25  171.2  174.3 
15 gallon High  20″ x 10″ x 18″  22  25  172.2 
175.3 
MIDSIZED AQUARIUMS 

Tank Size  L x W x H  Empty Weight  Plants & Rocks  Filled Weight Freshwater (Including Plants & Rocks) 
Filled Weight Saltwater (Including Plants & Rocks) 

Inches  lbs  lbs  lbs  lbs 
20 gallon High  24″ x 12″ x 16″  25  30  221.9 
226.1 
20 gallon Long 
30″ x 12″ x 12″  25  30  221.9  226.1 
25 gallon  24″ x 12″ x 20″  32  40  280.6 
285.9 
29 gallon 
30″ x 12″ x 18″  40  45  327  333.1 
30 gallon Breeder  36″ x 18″ x 12″  48  48  346.4 
352.6 
40 gallon Breeder 
36″ x 18″ x 16″  58  60  451.8  460.2 
40 gallon Long  48″ x 12″ x 16″  55  60  448.8 
457.2 
LARGE AQUARIUMS 

Tank Size  L x W x H  Empty Weight  Plants & Rocks  Filled Weight Freshwater (Including Plants & Rocks) 
Filled Weight Saltwater (Including Plants & Rocks) 

Inches  lbs  lbs  lbs  lbs 
50 gallon  36″ x 18″ x 19″  100  70  587.3 
597.7 
55 gallon 
48″ x 13″ x 21″  107  75  641  652.5 
65 gallon  36″ x 18″ x 24″  126  90  758.5 
772 
75 gallon 
48″ x 18″ x 21″  140  110  875.9  891.6 
90 gallon  48″ x 18″ x 24″  160  120  1031.1 
1049.9 
125 gallon 
72″ x 18″ x 21″  206  130  1379.2  1405.3 
150 gallon  72″ x 18″ x 28″  338  140  1729.8 
1761.1 
180 Gallon 
72″ x 24″ x 25″  350  170  2022.2  2059.7 
225 Gallon  72″ x 27.5″ x 27.5″  360  190  2427.7 
2474.7 
You can yourself verify these results by this aquarium size calculator free of cost and in seconds.
Let’s go by the guide below that is particularly arranged to let you know how to operate this fish tank calculator!
Input:
Output:
The free fish tank gallon calculator does the following calculations:
One of the major facts that an aquarium owner must care for is the water quality. Yes, you would not believe but the water is the component that is responsible for longevity of life or death for fish. Poor water may have poisonous particles in it and it is fatal for fish life. That is why you must go by changing the water every other day to keep your pet healthy. Moreover, you should also employ the aquarium calculator to calculate the water quantity sufficient to fill your tank and thus keeping your fish alive for long.
If you are nourishing a juvenile fish in your aquarium tank, then a small fish tank would cause some serious issues to your fish including:
Yes, definitely! A large fish tank provides a proper ecosystem with an inbuilt facility of selfcleaning. That is why the huge water volume and temperature remains stable enough to keep the environment lifefriendly for your fish.
It depends upon the size of the aquarium. When buying the tank, it is recommended to use this aquarium gallon calculator first to estimate the tank size you need to buy. After that, go for relating this result value with that fish tank size\s written on a sticker pasted on them.
The best size of the aquarium is to utilise a gallon of water per inch of a fish. To take instant assistance in this regard, we suggest you use this aquarium calculator.
Yes! Fish become very annoying while kept in small bowls or tanks. That is why you should go for selecting a reasonable fish tank and use a water pump in order to continue the flow of water.
Yes it does! In actuality, you must always choose the size of the pump bigger than the suggested. Let us take an example! If you buy an aquarium with a capacity of 80 gallons, you must buy a pump that is good to flow water of about 100 gallons.
Following are some precautionary measures that you should follow if looking to maintain water quality in aquarium:
If you install a filter in a fish tank, you must cope with the fact that water is passing at the rate of 4 times/hour from it. Otherwise, it will be speedy, pushing the fish away again and again, and thus creating an awkward environment for the fish.
There are exactly 22 gallons of water in a 100 litre tank that could also be checked by using the online aquarium calculator. Anyways, coming to the point, a 100L tank can accommodate about 22 fully grown fish.
Determining the volume of aquariums is not such an easy task. You will always have to look for the tanks that are more durable, strong to hold the maximum volume of water in it. And keeping in view these hurdles, you must go by utilising this aquarium calculator so as to estimate the fish tank size that would suit your choice.
From the source of Wikipedia: Aquarium, Antiquity, Aquarium filter, Materials suitable for aquarium filtration, Types