Tank Volume Calculator

The Tank Volume Calculator finds the total liquid capacity of a tank based on its shape and dimensions — useful for water storage, fuel tanks, aquariums, or any vessel where knowing the exact volume matters. Select your tank shape (horizontal cylinder, vertical cylinder, rectangular, or oval), then enter the dimensions and choose your dimension and volume units to get the total tank volume. Optionally, enter a fill depth to also see the filled volume, empty volume, and fill percentage.

For cylinders: length/height of the tank

For rectangular tanks

For rectangular tanks

For cylindrical and oval tanks

Optional: Calculate filled volume

Results

Total Tank Volume

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Filled Volume

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Empty Volume

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Fill Percentage

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Frequently Asked Questions

How to calculate the volume of a water tank?

Tank volume depends on the shape. For cylindrical tanks, use V = π × r² × h. For rectangular tanks, use V = length × width × height. Our calculator handles the math automatically for various tank shapes.

What's the difference between horizontal and vertical cylinder tanks?

Horizontal cylinders lie on their side and are often used for fuel storage. Vertical cylinders stand upright and are common for water storage. The volume formula is the same, but fill calculations differ based on orientation.

How do I calculate filled volume for a partially full tank?

Enter your fill depth in the calculator. For horizontal cylinders, the math is complex involving arc calculations. For vertical tanks, it's simply the base area times fill height.

Why do we prefer cylindrical water tanks over rectangular ones?

Cylindrical tanks distribute pressure more evenly, are stronger structurally, use less material for the same volume, and have no corners where sediment can accumulate.

What units can I use for tank calculations?

Our calculator supports metric (meters, centimeters, millimeters, liters) and imperial units (feet, inches, US/Imperial gallons, cubic feet). All conversions are handled automatically.

How accurate are these tank volume calculations?

Calculations assume perfect geometric shapes. Real tanks may have irregular features, wall thickness, or fittings that slightly reduce actual capacity. These calculations provide close estimates for planning purposes.

What is the volume of a standard oil barrel?

A standard oil barrel contains 42 US gallons or approximately 159 liters. However, tank volumes vary widely based on application and size requirements.

Can I calculate tank dimensions if I know the required volume?

While our current calculator finds volume from dimensions, you can work backwards by adjusting dimensions until you reach your target volume. Consider practical constraints like available space and structural requirements.