Aquarium volume calculator
Calculate how many liters a rectangular or cylindrical aquarium holds, the real water volume after subtracting substrate and decorations, the total weight, the filter flow rate and the heater power.
How to useHow many liters is my aquarium?
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Aquarium volume calculator: what it is for
Enter the aquarium's measurements, the substrate height and the gap to the rim. The calculator shows the gross liters, the real water volume for dosing products, the approximate weight when full, and the suggested filter flow rate and heater power.
How to use
- Choose the shape and enter the measurements.
- Enter the substrate and the gap.
- See liters, weight and equipment.
When to use it
- Dosing conditioner and medications.
- Choosing a filter and heater.
- Checking whether the stand can hold the weight.
Frequently asked questions
How do I calculate the aquarium's liters?
Multiply length × width × height in centimeters and divide by 1,000. A 60 × 30 × 40 cm aquarium holds 72 gross liters.
Why is the real volume smaller?
The substrate, rocks, driftwood and the gap to the rim take up space. In general, the water volume is between 80% and 90% of the gross volume; use the real volume to dose medications and conditioners.
Which filter and heater should I use?
A rule of thumb is a filter with a flow rate of 4 to 6 times the volume per hour and about 1 W of heater per liter in tropical aquariums, more in cold rooms.
Is it really free?
Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 are free.