How to Use the Aquarium Volume Calculator

The Aquarium Volume Calculator is a digital tool that helps aquarists determine the total water capacity of a fish tank based on its dimensions.

Whether you’re a hobbyist or a professional aquascaper, knowing the exact volume of your aquarium is crucial for everything from filtration sizing to fish stocking and dosing treatments.

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Why Use an Aquarium Volume Calculator?

Fish health and tank balance depend on accurate knowledge of your aquarium’s volume. Overdosing on chemicals or overstocking can be dangerous. This calculator simplifies the math for you.

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How to Use the Calculator

Step 1: Enter the Dimensions

• Input the length, width, and height of your aquarium in centimeters.

Step 2: Select Your Unit

• Choose either:
  • Liters for metric volume
  • US Gallons if you’re in the United States

Step 3: Press “Calculate Volume”

• The result shows the total water volume your tank can hold.

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Example

If your aquarium is:

• Length: 100 cm
• Width: 40 cm
• Height: 50 cm

Then the volume =
100 × 40 × 50 = 200,000 cm³,
which is 200 liters or approximately 52.83 gallons.

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FAQ: Aquarium Volume Calculator

What does this calculator measure?

It calculates the internal water capacity of a rectangular/square aquarium, based on entered dimensions.

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Does it include gravel, rocks, or decorations?

No. It calculates the total theoretical volume. Actual water capacity will be lower after adding gravel, filters, etc.

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Can I switch from gallons to liters easily?

Yes. Just use the dropdown to toggle between liters and US gallons.

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Does it support custom-shaped tanks?

No. This calculator assumes a box-shaped tank. For bowls or cylinders, you’d need a shape-specific calculator.