Quote:
Originally Posted by Redsoxticket
Formula
3.14 x d x h x 7.48 = gallons
Posted from my iPhone/Mobile device
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3.14 * d is the formula for the circumference, not the area. For the volume, you need to take the area, which is 3.14 * r^2. r = 6.5 feet or 78 inches in this case:
3.14 * 78^2 = 19,104 square inches
Then take the area and multiply it by the height (3 feet or 36 inches) to find the volume:
19,104 * 36 = 687,735 cubic inches
When you do this and then convert from cubic feet (or inches) to gallons, you get roughly 2977 gallons:
1 cubic inch = .00432900433 gallons
687,735 cubic inches * .00432900433 = 2977 gallons
That is the volume in a perfect world. You would have to deal with the sides caving in and other variables when totally full, so the realistic volume is a little less than 2977 gallons.