- Find your floating roof storage tank's circumference in inches. Take a tape measure and wrap it around the entire tank and record the measurement. Divide this number by 3.14 or "Pi." Take the number you get and divide it by 2 to find the radius of the tank.
- Find the height at which your floating roof is sitting at, in inches. Measure from the floating roof to the bottom of the storage tank.
- Multiply the radius by itself. This is also called "squaring" the radius.
- Multiply this number by the height of your floating roof. Multiply this number by 3.14 to find the volume of your floating roof liquid storage system.

## Things You Will Need

- Tape Measure