Tank Volume Calculator
Accurately estimate how much liquid is in your tank or determine its total capacity. This tool supports common shapes used for water, oil, and chemical storage.
How do I calculate the volume of a cylinder tank?
For a vertical cylinder, the formula is π × r² × h, where r is the radius and h is the height. For a horizontal cylinder, the calculation is more complex if the tank is only partially full, involving circular segment area math.
What is "Fill Volume"?
Fill volume is the amount of liquid currently in the tank, as opposed to the "Total Capacity," which is the maximum amount the tank can hold.
How many gallons are in a cubic foot?
There are approximately 7.48 US gallons in one cubic foot of volume.
Why does the calculation change for horizontal tanks?
In a vertical tank, the area of the liquid surface stays constant as it fills. In a horizontal tank, the "width" of the liquid surface changes depending on the depth, requiring trigonometric formulas to find the exact volume at different levels.