Guides
Calculating Hexagon and Corner Tank Volume
Odd-shaped aquariums are tricky to measure. Here is how to calculate the volume of hexagon and corner fish tanks accurately.
Read more →Triangle Fish Tank Volume Calculator
Volume
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Enter your tank dimensions to see the volume.
Did we solve your problem?
Calculate the volume of a triangular or corner-triangle aquarium. Enter the two base sides and the height to get the capacity in litres and gallons.
How triangle tank volume works
A triangular tank usually has a right-triangle base with two straight sides meeting at the corner. The volume is half of length times width times height, which the calculator applies for you.
Example sizes and volumes
| Length × Width × Height (cm) | Litres | US gallons |
|---|---|---|
| 40 × 40 × 40 | 32 | 8.5 |
| 50 × 50 × 45 | 56.3 | 14.9 |
| 60 × 60 × 50 | 90 | 23.8 |
| 80 × 80 × 55 | 176 | 46.5 |
Calculated with the same formula as the calculator above. Values are rounded.
Shape preview
Adjust the size and height to see this tank shape and its volume.
Volume ≈ — litres
Formula
V = ½ × length × width × height Related calculators
Frequently asked questions
How do I calculate triangle fish tank volume?
Enter the two base lengths and the height. The volume is half of length times width times height.
What shape is a triangle fish tank?
Most are corner tanks with a right-triangle base, fitting neatly into the corner of a room.
How do I get the result in gallons?
Switch the result unit to US or UK gallons after entering your dimensions.
Why is the volume halved?
A triangle is half of a rectangle with the same base and height, so the box volume is halved.
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.
Guides
How to Find the Volume of a Fish Tank
How to measure a fish tank properly and find its volume in litres and gallons, with formulas for rectangular, cylinder, hexagon and corner tanks.
Read more →Conversions
How Many Gallons Is My Fish Tank? Calculate Aquarium Gallons
Measure your tank and divide by 231 for US gallons. Worked examples, US vs UK gallons, and how to identify an unknown tank by its footprint.
Read more →