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Fish Tank Volume Calculator

Fish Tank Volume Calculator in MM

Volume

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Enter your tank dimensions to see the volume.

Did we solve your problem?

Calculate aquarium volume from measurements in millimetres. Enter the dimensions in mm and read the result in litres and gallons.

Working in millimetres

Millimetres give very precise measurements. Multiply length, width and height in millimetres, then divide by a million for litres, since 1,000,000 cubic millimetres make one litre.

Volume at a glance

Drag to fill a 60 by 30 by 30 cm (54 L) tank and watch the volume change.

50% full = 27 L

Formula

V = length × width × height

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Frequently asked questions

How do I calculate fish tank volume in mm?
Enter the dimensions in millimetres and the calculator converts them to litres, gallons and cubic centimetres.
How many cubic millimetres in a litre?
One litre equals 1,000,000 cubic millimetres.
Should I use mm or cm?
Both work. Millimetres are more precise, while centimetres are easier to read off a tape measure.
How many litres is a 600x300x300 mm tank?
That is the same as 60x30x30 cm, which holds 54 litres.
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.