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Calculate water tank volume easily using our free water tank volume calculator. Find tank capacity in litres, cubic meters, and gallons instantly.
Knowing how much water your tank can hold is important in daily life. It helps in homes, farms, industries, aquariums, and even small containers like buckets. That is why we developed this Water Tank Volume Calculator.
This tool lets anyone calculate water tank volume quickly, accurately, and without confusion.
Whether you want to know how much water fits in a tank, how many litres your aquarium holds, or how to calculate the volume of a water tank, this calculator makes the job easy.
The volume of a water tank depends on its shape and dimensions. Most water tanks are either rectangular or cylindrical.
The calculation becomes accurate only when all dimensions are measured correctly and converted into the same unit.
Our water tank volume calculator automatically handles unit conversion and applies the correct mathematical formula behind the scenes.
The rectangular tank volume formula is:
Volume = Length × Width × Height
If the dimensions are in meters, the result is in cubic meters.
To convert cubic meters to litres, multiply the result by 1000.
So the final relation becomes:
Volume in litres = Length × Width × Height × 1000
The cylindrical tank volume formula is:
Volume = π × Radius² × Height
If the diameter is given instead of radius, the formula becomes:
Volume = π × (Diameter ÷ 2)² × Height
Again, when dimensions are in meters:
Volume in litres = π × Radius² × Height × 1000
Here, π (pi) is approximately equal to 3.1416.
Using the online water tank volume calculator is very simple and beginner-friendly.
The calculator instantly shows the water tank volume in cubic meters, litres, and US gallons along with clear calculation steps.
Suppose a tank has a length of 2 meters, width of 1 meter, and height of 1.5 meters.
Volume = 2 × 1 × 1.5
Volume = 3 cubic meters
Since 1 cubic meter equals 1000 litres:
Total water capacity = 3 × 1000 = 3000 litres
Many users ask, how many litres is a 90x45x45 aquarium?
Convert centimeters to meters first:
90 cm = 0.9 m
45 cm = 0.45 m
45 cm = 0.45 m
Now apply the formula:
Volume = 0.9 × 0.45 × 0.45
Volume = 0.18225 cubic meters
In litres:
0.18225 × 1000 = 182.25 litres
So, a 90x45x45 aquarium holds approximately 182 litres of water.
This is a common question.
1 US gallon equals 3.78541 litres.
So:
5 gallons × 3.78541 = 18.93 litres
A 5 gallon bucket can hold about 19 litres of water.
To calculate how much water fits in a water tank, you need three things:
the shape of the tank, the correct dimensions, and the proper formula.
Our calculator removes all manual effort.
It converts units, applies formulas, and gives accurate results instantly.
This makes it ideal for household water tanks, aquariums, rainwater tanks, and storage containers.
The Water Tank Volume Calculator is built for accuracy, speed, and simplicity.
It follows standard engineering formulas and handles all unit conversions automatically.
Whether you are calculating a small bucket, a large water tank, or an aquarium, this tool gives reliable results every time.
If you want an easy way to calculate water tank volume without math stress, this calculator is the perfect solution.
You calculate water tank volume using length, width, and height for rectangular tanks, or radius and height for cylindrical tanks. Our calculator does this automatically.
Measure the tank dimensions, select the correct shape, and enter the values into the water tank volume calculator to get the total capacity.
Multiply 5 gallons by 3.78541. The result is about 18.9 litres.
A 90x45x45 cm aquarium holds approximately 182 litres of water.
Yes. It uses standard mathematical formulas and precise unit conversion for 100% accurate results.