Aquarium Volume Calculator
Fill in the values and the answer updates as you type.
How the Aquarium Volume Calculator works
Volume in liters = length × width × height × water level in cm ÷ 1,000. Measure the inside of the glass, not the outside. One US gallon is 3.78541 liters. Substrate, rocks, and decor displace water, so the real volume is a little lower than the result, often by 5 to 10 percent. Use the water volume to size heaters, filters, and doses. Example: A 90 × 45 × 50 cm tank filled to 90 percent holds 182.3 liters, or 48.1 US gallons.
Inputs and results
The Aquarium Volume Calculator takes 4 inputs and gives 3 results.
What you enter
- Inside length (cm) — starts at 90.
- Inside width (cm) — starts at 45.
- Inside height (cm) — starts at 50.
- Water level (% of tank height) — starts at 90.
What you get
- Water volume (liters)
- Water volume (US gallons)
- Full tank capacity (liters)
Example: Aquarium Volume Calculator with the starting values
With inside length 90 cm, inside width 45 cm, inside height 50 cm and water level 90 % of tank height, the calculator returns:
| Water volume (liters) | 182.3 |
|---|---|
| Water volume (US gallons) | 48.1 |
| Full tank capacity (liters) | 202.5 |
Change any value above and the results update straight away.
Aquarium Volume Calculator FAQ
How do I use the Aquarium Volume Calculator?
Enter inside length, inside width, inside height and water level in the fields, then read water volume (liters), water volume (us gallons) and full tank capacity (liters) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Aquarium Volume Calculator calculate?
Water volume of a rectangular tank in liters and gallons. It returns water volume (liters), water volume (us gallons) and full tank capacity (liters) from the 4 values you provide.
What values does the Aquarium Volume Calculator start with?
It opens with inside length 90 cm, inside width 45 cm, inside height 50 cm and water level 90 % of tank height so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Aquarium Volume Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Aquarium Volume Calculator for medical or health decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm medical or health decisions with a qualified professional. See the Disclaimer for more.