Fish Tank Volume Calculator
Whether you’re buying a fish tank for the first time or considering adding new fish to an already established aquarium, you’ll first need to understand how much water your tank can hold to know how many fish you can safely keep.
Our fish tank volume calculator helps you quickly determine how many gallons or litres of water your tank holds, whether it’s a rectangular, cylindrical, or spherical aquarium, to help give you accurate measurements that make fish keeping easy.
How to use the fish tank calculator
Our calculator is made to take all the guesswork out of calculating your tank's volume. With a few simple inputs, you can have an accurate number in both gallons and litres to help give you peace of mind and ensure your fish have a happy home.
Select Tank Shape & Measurement
Enter Dimensions below
Enter Dimensions below
The Width will be halved to find the radius
Enter Dimensions below
The Width will be halved to find the radius
*Disclaimer: The above calculator is a tool which calculates the approximate capacity of water volume in your fish tank. It is designed to be used as a guide for this purpose only. Those using this tool for tank treatment do so at their own risk. Always follow the manufacturer’s instructions, and consider factors such as aquarium contents (substrates, ornaments) as well as water level and glass thickness.
FAQs
Why is having the right amount of water in a fish tank important?
Knowing the volume of water your tank can hold is important because it can affect a variety of things when it comes to fishkeeping. This includes factors such as:
- Calculating how many fish you can safely keep in your tank
- Calculating the right dosage of treatments, additives, and chemicals needed when treating your water.
- Awareness of how often you should change or refresh the water to keep your fish healthy and happy.
- Knowing which filters and air pumps will work best with the volume of water you have for a cleaner and healthier tank.
How do I calculate the volume of my fish tank?
Our handy fish tank volume calculator can help come up with an accurate number in seconds; however, if you wish to double-check by doing it manually, then the volume of a fish tank is calculated by multiplying its length, width, and height.
For example, if you have a tank that's 91cm by 60cm, and let's say it's 60cm high, the volume would be 91 x 60 x 60 = 327,600cm.
To convert cubic feet to litres, you divide the volume in cubic centimetres by 1000. So 327,600 divided by 1000 = 327.6 litres of water.
How do I know how many fish I can have in my aquarium?
The amount of fish you can have in a fish tank depends on the tank volume and size. However, the general rule is that for every one gallon of water in your tank, you can have one inch of fish, as discussed in our guide on how many fish can you put in a fish tank. We recommend taking a look at this guide and using your tank's volume along with the guide's measuring system to understand exactly how many fish you can house in your aquarium safely.
Does the shape of the aquarium impact its volume?
Yes, the shape of your aquarium does affect the volume. Even if the dimensions are the same, different shapes will hold different volumes of water. Our calculator makes things easy, and you pick the shape of your aquarium to help give you an accurate volume measurement in seconds. Pick from sphere, cylindrical, and square/rectangular tanks and input the measurements in only a few quick and easy steps.
What size aquarium is best for you?
Selecting the right aquarium for you and your skill level is one of the most important steps in becoming a fish owner. The size of your aquarium will not only determine the number of fish you have but also how difficult it will be to care for your aquarium. Having a smaller tank means a smaller ecosystem, and this is typically a good starting point for beginners.
A few things you should consider when picking the right size include:
- How much space you have in your home
- What type of fish you plan to keep (fish such as goldfish will need more space, but smaller fish like bettas can live comfortably in a relatively small tank).
- How much time you have: bigger tanks usually need more maintenance, so they will require more time and energy.
- Your skill level. As mentioned above, smaller tanks are easier to maintain and are much better suited for beginners.
- Budget. Aquariums require a lot of cleaning tools and equipment to keep the ecosystem healthy and your aquatic animals happy. If you’re on a tight budget, then sticking to a smaller tank can be much more cost-effective.
Ready to create the perfect fish tank?
Now that you’ve got the calculations you need to create a thriving aquarium, you can use these numbers to help you find the right equipment to help maintain a happy aquarium.
Here at Aquacadabra, along with our handy fish tank calculator, we stock everything fish keepers need to create a healthy environment for their aquatics. Browse reliable aquarium filters, air pumps and aquarium heaters, and use your water volume to find the best matches for your aquarium size, ensuring you and your fish can enjoy a thriving aquarium ecosystem.
Or if you want to learn more about the important aspects of fishkeeping, you can read through our helpful blogs on finding the right place to set up an aquarium and how to get rid of cloudy water for more helpful guidance in maintaining a balanced home for your aquatics.
