Tank Volume Calculator

Find the capacity of a vertical cylindrical tank — for water storage, fuel, brewing or chemicals.

How the Math Works

The Tank Volume Calculator uses the fundamental geometric formula for the volume of a cylinder: V = πr²h. Since we measure tank diameter rather than radius, the formula becomes V = π × (diameter/2)² × height. This calculates the space inside a vertical cylinder by finding the area of the circular base (πr²) and multiplying by the height. The result is then converted from cubic units to gallons or liters using standard conversion factors (1 cubic foot = 7.48052 gallons, 1 liter = 0.001 cubic meters).

Practical Applications

To use this calculator practically, simply enter the tank's inside diameter and total height into the designated fields. For accuracy, measure the internal dimensions rather than external ones, as wall thickness reduces the actual volume. This calculation is essential for determining liquid capacity in oil storage tanks, water treatment facilities, chemical processing equipment, and agricultural storage vessels where knowing exact volume is critical for operational planning and safety compliance.

Day-to-Day Use

In everyday life, this calculator helps homeowners determine how much water their well tank can store, or how much fuel remains in a propane or heating oil tank by measuring the height of liquid. It's useful for businesses that need to track inventory levels in cylindrical containers, calculate costs for bulk purchases, or ensure proper sizing of tanks for residential well systems, rainwater collection setups, or swimming pool maintenance.

Worked example

4 ft diameter, 6 ft tall → π × 2² × 6 = 75.4 ft³ ≈ 564 gallons.

FAQ