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Use this aquarium calculator to measure the volume of the fish tank and determine how much water you need to fill up your aquarium box.
Having an accurate water volume is crucial for various aspects of aquarium management, such as appropriate aquarium stocking levels, water treatment dosages, and overall tank maintenance. It helps in choosing the optimal aquarium size and sizes for powerheads and return pumps.
Aquariums come in various shapes, each requiring specific volume formulas for precise calculation.
See the following tank volume formulas for various fish tank shapes:
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
Volume = (2 * (front width²) * (1+√2)) * height
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
Bowfront = Height * Width * Length + 0.5 * r^2 * (α – sin(α)) * Height
Where:
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
Use the abovementioned formulas to determine your fish tank’s volume and verify the results of your calculations with the help of our aquarium Calculator.
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 
Based on saltwateraquarium.com.
The manufacturers often mention the volume of every aquarium to easily estimate the required volume of water to fill the tank. If it’s not written, then you may subject the aquarium calculator to perform the precise calculation. It is equipped with the respective volume formulas for various aquarium shapes.
Yes, each shape has a different volume formula. For example, the formula of a rectangular shape depends on the length, width, and height, whereas a cube formula relies on its length.
The Significant drawbacks include the quick occurrence of problems because of the small size of the fish tank. Because of the limited water volume swift temperature changes can happen, affecting the overall health of the fish.
Yes, definitely! A large fish tank provides a proper ecosystem with a builtin facility for selfcleaning. That is why the huge water volume and temperature remain stable enough to keep the environment lifefriendly for your fish.