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Aquarium Calculator

Select the tank shape and enter aquarium dimensions to find your tank’s water volume.

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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.

How To Estimate Aquarium Water Volume?

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 Prism Shape:

rectangular fish tank

Rectangular = Height * Width * Length

Cubic Shape:

cubic fish tank

Cube = Length^3

Regular Hexagonal Shape:

For a regular hexagon, each side is of the same length. So we have: Volume = ((3*√3)/2) * Front Width² * Height

Flat Back Hexagon Shape:

flat back hexagonal fish tank

Volume = (((((3*√3)/2) * front width²)/2) + (side * length)) * height

Octagonal Shape:

octagonal fish tank

Volume = (2 * (front width²) * (1+√2)) * height

Cylindrical Shape:

cylindrical fish tank

Regular Cylinder:

Cylinder = π * (Diameter / 2)^2 * Height

Half Cylinder:

half cylindrical fish tank

Half_Cylinder = π * (Diameter / 2)^2* Height / 2

Quarter Cylinder:

quarter cylindrical fish tank

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

Bow Front Shape:

bow front fish tank

Bowfront = Height * Width * Length + 0.5 * r^2 * (α - sin(α)) * Height Where:

  • α = Central angle
  • r = Circle section radius

L Shaped Tank:

L shaped fish tank

Volume = ((Length 1 * Width 1) + ((Length 2 – Width 1) * Width 2)) * Height

Elliptical Shape:

elliptical fish tank

Volume³ = ? * radius 1 * radius 2 * height

Corner Pentagon Shape:

Corner Prism Tank:

corner prism fish tank

Volume = ((Length 1 * Length 2)/2) * Height

Use the above-mentioned formulas to determine your fish tank's volume and verify the results of your calculations with the help of our aquarium Calculator. 

Aquarium Weights & Sizes:

SMALL-SIZED 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

MID-SIZED 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.

FAQ’s:

Does Shape of The Aquarium Impact Its Volume?

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.

What Happens If Fish Tank Is Too Small?

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.

Are Bigger Aquariums Easier To Maintain?

Yes, definitely! A large fish tank provides a proper ecosystem with a built-in facility for self-cleaning. That is why the huge water volume and temperature remain stable enough to keep the environment life-friendly for your fish.

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