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Aquarium Volume Calculator
Calculates a tank’s actual water volume after substrate and fill level, plus its filled weight, filter turnover and heater size.
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Enter your figures and press Calculate.
In short
Aquarium Volume Calculator is a free online tool on inputtesthub.com that calculates a tank’s actual water volume after substrate and fill level, plus its filled weight, filter turnover and heater size. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Aquarium Volume Calculator
- Enter your figures in the input fields.
- The result updates as you type, together with the full working.
- Check the breakdown table to see exactly how the number was reached.
About the Aquarium Volume Calculator
The Aquarium Volume Calculator calculates a tank’s actual water volume after substrate and fill level, plus its filled weight, filter turnover and heater size. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Dosing medication or fertiliser by real volume, not the advertised size.
- Sizing a filter and heater.
- Checking the floor can take the weight before filling.
Details
| 1 litre of water | 1 kg |
|---|---|
| Filter turnover | 4× volume per hour |
| Heater | ≈ 1 W per litre |
| 1 US gallon | 3.785 litres |
The maths behind it
This tool uses Gross litres = length × width × height ÷ 1000. Actual water volume subtracts the substrate and the unfilled gap at the top. Every intermediate value is shown on screen, so the result can be checked by hand.
A 120 × 40 × 50 cm tank is well over 200 kg once filled — that is a piano on four small feet, and ordinary furniture is not built for it. Dosing by the advertised tank size also overdoses, because substrate and the gap at the top are not water.
Frequently asked questions
How many litres is a 120x40x50 aquarium?
240 litres gross, but only about 196 litres of actual water once you allow for a 90% fill level and 5 cm of substrate. That lower figure is the one to dose medication against.
How much does a full fish tank weigh?
Roughly one kilogram per litre of water, plus the glass and substrate. A 200 litre tank comes to well over 250 kg — check the stand and the floor before filling.
Does the Aquarium Volume Calculator cost anything?
There is no cost and no cap. The Aquarium Volume Calculator is not a demo of a paid product, so nothing is held back or watermarked.
Does anything I enter leave my computer?
No. The Aquarium Volume Calculator runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
What formula does the Aquarium Volume Calculator use?
It uses Gross litres = length × width × height ÷ 1000. Actual water volume subtracts the substrate and the unfilled gap at the top. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What problem does the Aquarium Volume Calculator solve?
Typical uses: dosing medication or fertiliser by real volume, not the advertised size. Sizing a filter and heater. Checking the floor can take the weight before filling. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Any caveats I should know about?
A 120 × 40 × 50 cm tank is well over 200 kg once filled — that is a piano on four small feet, and ordinary furniture is not built for it. Dosing by the advertised tank size also overdoses, because substrate and the gap at the top are not water.
What are the reference figures here?
1 litre of water is 1 kg. Filter turnover is 4× volume per hour. Heater is ≈ 1 W per litre. These are printed on the page itself, so you do not have to take them on trust.
How precise is the result?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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