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Fish Tank Volume Calculator

Bowfront Fish Tank Volume Calculator

Volume

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Enter your tank dimensions to see the volume.

Did we solve your problem?

Calculate the volume of a bow-front aquarium with its gently curved front panel. Enter the dimensions and get the capacity in litres and gallons.

How bow-front volume works

A bow-front tank is a rectangular box plus a thin curved segment along the front. The calculator adds the box volume and the curved segment together, so you get an accurate figure rather than a rough estimate.

Shape preview

Adjust the size and height to see this tank shape and its volume.

Volume ≈ — litres

How to calculate fish tank volume

Measure the length, width and height of your tank, then multiply them together. Change the values below and the diagram and the calculation update instantly.

  1. 1

    Measure length, width and height

    60 x 30 x 30 cm

  2. 2

    Multiply them for cubic centimetres

    60 x 30 x 30 = 54,000 cm³

  3. 3

    Convert to litres and gallons

    54,000 ÷ 1000 = 54 litres (14.27 US gal)

Formulas behind the fish tank volume calculator

Prefer to calculate the aquarium size by hand? Here is the volume formula for each tank shape. Click a card to try it in the calculator.

For unusual tanks, see a triangular prism volume tool, and note that spherical aquariums (fish bowls) are not recommended for keeping fish.

Aquarium shapes

Our fish tank volume calculator supports seven popular aquarium shapes. Click any shape to load it into the calculator above.

Frequently asked questions

How do I calculate bow-front tank volume?
Select the bow front shape, enter the length, width, full width and height, and the calculator adds the curved segment automatically.
What is full width on a bow-front tank?
It is the depth at the deepest point of the curve, measured front to back at the centre of the bow.
Does the curve add much volume?
Only a few percent, but for an accurate dose and stocking figure it is worth including.
Are bow-front tanks harder to measure?
Slightly, because of the curve, which is why the calculator uses a segment formula for the front.
What units can I use in this calculator?
You can switch between centimetres, millimetres, inches, feet and metres at any time. Enter all dimensions in the same unit and the result updates instantly.
Does the result include substrate and decoration?
The figure is the full internal capacity. Subtract roughly 10 to 15 percent for substrate, rocks and the gap you leave at the top to estimate the real water volume.
How accurate is this fish tank calculator?
It uses the exact geometric formula for each shape, so the result is accurate for the dimensions you enter. Measure the inside of the tank for the best accuracy.
Is this calculator free to use?
Yes. It is completely free, needs no sign-up, and works on phones, tablets and desktops.

Calculator tools

Explore our specialised fish tank volume calculators, each tailored for a specific unit, shape or region.

In Gallons In Litres Tank Size Capacity Dimensions Water Volume Tank Weight In CM In MM In Inches In Feet Metric Hexagon Corner Cylinder & Round Bow-front Triangle Octagon Pentagon Surface Area UK Australia

Related guides

Learn the core ideas behind fish tank volume before or after using the calculator.