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Aquarium volume calculator
Litres in a fish tank, how many fish it suits and the filter flow it needs.
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- Works on any device
About Aquarium volume calculator
Enter tank length, width and water height to get litres: centimetres multiplied together and divided by 1000. It then estimates how many small fish suit the tank and the filter flow needed, commonly about four to six times the tank volume per hour. Subtract gravel and decorations for real water volume.
How to use Aquarium volume calculator
- Set the options above. The result updates live.
- Change anything until it's just right.
- Copy the result or download it.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Available in 10 languages.
Also known as
Frequently asked questions
How many fish can I keep per litre?
A rough rule is one centimetre of adult fish per litre, but species, filtration and activity matter. Research each species and avoid overstocking.
Is Aquarium volume calculator free?
Yes. Aquarium volume calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.