Aquarium Volume Calculator Guide: Litres, Gallons and Filter Size
If you want the short answer, tank litres matter because they drive almost every other aquarium buying decision, heater size, filter flow, stocking level and water treatment dose.
The catch is a lot of people guess their tank size, then buy accessories that are either underpowered or overkill.
Need the litres quickly?
Use the Aquarium Volume Calculator and get litres and gallons from your dimensions.
Use the Aquarium Volume Calculator and get litres and gallons from your dimensions.
Worked example
A tank that is 90cm long, 45cm wide and 45cm high holds about 182 litres before you account for substrate, decor and real fill level.
Why the number matters
- Heater sizing
- Filter turnover
- Water conditioner dosing
- Stocking sanity
Bottom line
If you do not know the tank volume, you are guessing on too many other things. Use the calculator first, then buy the gear to match.