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How Much Aquarium Substrate Do I Need?
Work out exactly how much gravel, sand or aqua soil your tank needs, the right depth, and how many bags to buy.
Read more →Fish Tank Size Calculator
Volume
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Enter your tank dimensions to see the volume.
Did we solve your problem?
Find the true size of your aquarium from its measurements. Enter the inside length, width and height and get the size in litres and gallons.
What is fish tank size?
Tank size is its internal volume, the amount of water it can hold. Measure the inside of the glass, multiply length by width by height, and convert to litres or gallons.
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 Related calculators
Frequently asked questions
How do I calculate the size of a fish tank?
Measure the inside length, width and height, multiply them, then convert to litres or gallons using the calculator above.
How big is my fish tank?
Enter your measurements and the size appears in litres, US gallons and UK gallons.
Should I measure inside or outside the glass?
Use the internal measurements for an accurate size, because the glass thickness does not hold water.
What size tank do beginners need?
A tank of 40 to 75 litres is a forgiving starter size, as larger volumes keep water parameters more stable.
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.
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