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Fish Tank Volume Calculator

Fish Tank Volume Calculator in Inches

Volume

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Enter your tank dimensions to see the volume.

Did we solve your problem?

Calculate aquarium volume from measurements in inches. Enter the dimensions in inches and read the result in gallons and litres.

Working in inches

Inches are common for US aquariums. Multiply length, width and height in inches for cubic inches, then divide by 231 for US gallons. The calculator handles this for you.

Common tank sizes and their volume

Dimensions (in)in³LitresUS gallons
16 × 8 × 101,280215.5
20 × 10 × 122,4003910.4
24 × 12 × 164,6087619.9
30 × 12 × 124,3207118.7
30 × 12 × 186,48010628.1
36 × 18 × 1610,36817044.9
48 × 13 × 2113,10421556.7
48 × 18 × 2118,14429778.5
48 × 18 × 2420,73634089.8
72 × 18 × 2127,216446117.8

Calculated with the same formula as the calculator above. Values are rounded.

Volume at a glance

Drag to fill a 60 by 30 by 30 cm (54 L) tank and watch the volume change.

50% full = 27 L

Formula

V = length × width × height

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Frequently asked questions

How do I calculate fish tank volume in inches?
Enter the dimensions in inches and the calculator returns the volume in US gallons, UK gallons and litres.
How many cubic inches in a US gallon?
One US gallon equals 231 cubic inches.
How big is a 24x12x16 inch tank?
That is 4,608 cubic inches, about 19.9 US gallons or 75 litres.
Can I switch to centimetres?
Yes, change the unit in the calculator and re-enter your measurements.
What units can I use in this calculator?
You can switch between centimetres, millimetres, inches, feet and metres at any time. Enter all dimensions in the same unit and the result updates instantly.
Does the result include substrate and decoration?
The figure is the full internal capacity. Subtract roughly 10 to 15 percent for substrate, rocks and the gap you leave at the top to estimate the real water volume.
How accurate is this fish tank calculator?
It uses the exact geometric formula for each shape, so the result is accurate for the dimensions you enter. Measure the inside of the tank for the best accuracy.
Is this calculator free to use?
Yes. It is completely free, needs no sign-up, and works on phones, tablets and desktops.

Related guides

Learn the core ideas behind fish tank volume before or after using the calculator.