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Remaining gallons in a cylindrical tank.

Mon Feb 13, 2006 4:23 pm

We have a cylindrical tank. When me measure the remaining fluid inside the tank by inches, how do we know how many gallons remain? What is formula?

Mon Feb 13, 2006 8:33 pm

You need to measure the diameter of the tank as well.

The formula to calulate the volume of the remaining fluid inside the cylindrical tank is:

π(d/2)²h, where π = 3.14, d - diameter of the cylindrical tank, and h - the height of the "remaining fluid inside the tank".

The following calculator allows you to enter the measurement in inches and calculate the volume of a cylinder in various units, including US gallons:

http://www.aqua-calc.com/calc_volcyl.php

Mon Feb 13, 2006 11:39 pm

That formula works for a vertical cyclinder.

A lot of home tanks are horizontal cylinders, and the formula is much messier. It was in a prior thread here however,

More info

List of all units you can convert online
Metric conversion
Convert pounds to gallons
Convert grams to cups
Grams to milliliters
Imperial vs US Customary
History of measurement