All answers presume measurements are in Decimal form of feet (i.e. 1.5 feet, rather than 1 foot 6 inches or 0.5 yards)
If the tank is cylindrical (generally what people refer to as a "rounded" tank), then here is the formula:
diameter of the circular end * PI (3.14159...) * Length of the tank * 7.48052 (gallons per cubic feet)
If you are talking about a spherical tank, then here is the measurement:
Radius of the sphere, cubed * PI * 7.48052 * 4 / 3
if you know the Diameter of the sphere, the radius is one half this.
If you know the circumference of the sphere, the radius is one half this, then further divided by PI.
If the tank is a "squashed cylinder" (i.e. a cylinder where one end axis is longer than the other) - in other words, a cylinder with an eliptical cross-section, then the measurement is:
Length of the tank * length of the long axis of the elipse end * length of the short axis of the elipse end * PI * 7.48052
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First calculate cubic feet: 3.1417 x Radius² x Depth = cubic feetNext calculate gallons: Cubic ft x 7.47 = gallons
There are 0.004 gallons per cubic inch in a round horizontal tank. You just said per inch, but actually, you must calculate cubic inches in order to convert to gallons. Cubic inches is calculated by: volume=pir2h. pi=3.14159 r=radius h=height radius=1/2xdiameter
It can be any shape that will hold 4000 gallons. Round, Square and so on. As long as the volume adds up to be 4000 gallons.
1,000,000 US gallons is about 134,000 cubic feet. A round tank of 56 feet diameter by 56 feet high will hold 1 million US gallons. Also a round pond of about 413 feet diameter by 1 foot deep.
you use the formula: Pi x radius (half the diameter) squared.