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Aquarium Calculator

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

Select Tank Shape:

Length :

in ▾

Height :

m ▾

Width :

m ▾

Front Pane :

ft ▾

End Pane :

ft ▾

Radius:

ft ▾

Radius 2:

ft ▾

Radius 1:

ft ▾

Length Short side:

ft ▾

Length Long side:

ft ▾

Width 1:

ft ▾

Width 2:

ft ▾

Length 1:

ft ▾

Length 2:

ft ▾

Fill Depth (Tank Volume):

ft ▾

Full Width :

ft ▾

Related

Use this aquarium calculator to measure the volume of your fish tank and determine the exact amount of water needed to fill it. Accurate water volume is essential for proper aquarium care, including the right number of fish, correct medication doses, and effective tank maintenance. It also helps in selecting the correct aquarium size, powerheads, or return pumps.

How to Estimate Aquarium Water Volume?

Since aquariums come in different shapes and dimensions, each requires a specific calculation formula to determine water volume accurately. Below are the formulas for the most common aquarium shapes:

Rectangular Prism Shape:

rectangular fish tank

Volume = Height × Width × Length

Cubic Shape:

cubic fish tank

Volume = Length³

Regular Hexagonal Shape:

All sides are equal. Volume = ((3√3)/2) × (Front Width)² × Height

Flat Back Hexagon Shape:

flat back hexagonal fish tank

Volume = ((((3√3)/2) × (Front Width)²)/2 + (Side × Length)) × Height

Octagonal Shape:

octagonal fish tank

Volume = 2 × (Front Width)² × (1 + √2) × Height

Cylindrical Shape:

cylindrical fish tank

Regular Cylinder:

Volume = π × (Diameter / 2)² × Height

Half Cylinder:

half cylindrical fish tank

Volume = (π × (Diameter / 2)² × Height) / 2

Quarter Cylinder:

quarter cylindrical fish tank

Volume = π × Radius² × Height / 4

Note: Diameter = 2 × Radius

Bow Front Shape:

bow front fish tank

Volume = Height × Width × Length + 0.5 × r² × (α − sin(α)) × Height

α = Central angle of the curved section
r = Radius of the bow front curve

L Shaped Tank:

L shaped fish tank

Volume = ((Length1 × Width1) + ((Length2 − Width1) × Width2)) × Height

Elliptical Shape:

elliptical fish tank

Volume = ? × Radius1 × Radius2 × Height

Corner Prism Tank:

corner prism fish tank

Volume = ((Length1 × Length2)/2) × Height

Use these formulas to calculate your aquarium volume and verify your results with our online Aquarium Calculator.

Aquarium Weights & Sizes

Tank Size	L × W × H	Empty Weight	Plants & Rocks	Filled Weight Freshwater	Filled Weight Saltwater
SMALL-SIZED AQUARIUMS
2 1/2 gallon	12" × 6" × 8"	3 lbs	3 lbs	26.9 lbs	27.4 lbs
5 gallon	16" × 8" × 10"	7 lbs	10 lbs	58.7 lbs	59.8 lbs

Source: saltwateraquarium.com

FAQ’s

Does the Shape of the Aquarium Impact Its Volume?

Yes, each aquarium shape requires a different volume formula. For instance, a rectangular tank uses length × width × height, whereas a cube relies on length³.

What Happens If the Fish Tank Is Too Small?

A small tank can lead to rapid water parameter changes, causing stress and health problems for fish due to the limited water volume.

Are Bigger Aquariums Easier to Maintain?

Yes. Larger tanks offer more stable ecosystems and water parameters, making maintenance easier and providing a healthier environment for fish.

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