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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.

Example sizes and volumes

Length × Full width / Width × Height (cm)LitresUS gallons
60 × 35 / 30 × 408021.1
80 × 40 / 35 × 4513836.5
90 × 45 / 38 × 50192.150.7
120 × 50 / 45 × 5531984.3
150 × 60 / 50 × 60510.2134.8

Calculated with the same formula as the calculator above. Values are rounded.

Shape preview

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

Volume ≈ — litres

Formula

V = (l × w × h) + ½ r² (α − sin α) × h

Related calculators

Hexagon Corner Cylinder & Round Triangle Octagon Pentagon

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.

Related guides

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