Aquarium Volume Calculators
It is a good idea to write down your volume and keep it somewhere safe (e.g. on the inside of your aquarium cabinet door)
You can take off roughly 10% of your volume to account for decor (rocks, gravel etc.) and space above the water line.
Choose your tank shape from the calculators below, enter your tanks measurements in centimetres (cm) and click 'calculate' to work out your tanks volume.
How do you calculate volume for an odd shaped fish tank?
Fish tanks come in all shapes and sizes, our volume calculators below cater for most known shapes. Choose the tank that's nearest to the shape of your own, enter the details and calculate the volume. It's that simple.
Convert inches to Centimetres For Your Aquarium
If you prefer to measure in inches use the converter below to change your measurements to centimetresIN x 2.54 = CM | FT x 30.48 = CM
Calculate Fishtank Volume For Rectangular / Square tanks
Calculate Fishtank Volume For Cylindrical fish tanks
Calculate Fishtank Volume for Corner tanks
Fishtank Volume Calculator Hexagon tanks
Fishtank Volume For Octagon tanks
Fishtank Volume for Round Spherical tanks
Enter the circumference of your tank below to work out the radius. Radius is also half the diameter, or height, of your sphere.
Enter your radius below:
Buy a new Aquarium for your home
Looking to buy a new fish tank or aquarium? Check out our partner link for a great selection of aquariums of all different shapes and sizes. Most new aquaria will also state the volume and dimensions so you'll have a head start.