Pick your tank shape and enter the dimensions — length, width, height, or diameter depending on the shape — then add a fill depth to get your total tank volume alongside the filled volume, empty volume, and fill percentage in whatever unit works for you.
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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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.
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.
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.
Cylindrical tanks distribute pressure more evenly, are stronger structurally, use less material for the same volume, and have no corners where sediment can accumulate.
Our calculator supports metric (meters, centimeters, millimeters, liters) and imperial units (feet, inches, US/Imperial gallons, cubic feet). All conversions are handled automatically.
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.
A standard oil barrel contains 42 US gallons or approximately 159 liters. However, tank volumes vary widely based on application and size requirements.
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.