Multiply all the numbers to get the volume of the pool in cubic feet. Then divide by 7.5. That assumes the water is filled to a height of four feet. Some above-ground pools have 52" walls, which allow for a water height of 48", which is four feet. The dimensions stated above in the reworded question are for an oval pool, not a round one. I suspect the original question was for a round pool with an 18' diameter and a 4.5' wall. (The slash in 4 1/2 did not show up in the question.) If that is the case, then the answer is 3.14 times 81 times 4.5 divided by 7.5.
18ft = Circumference = 2*pi*radius -> radius = circumference/(2*pi) = 18/(2*3.14...) = 2.865
Volume of a cylinder = depth*pi*radius2 = 4ft*3.14...*2.8652 = 103.13 ft3
Google says that 1 cubic foot = 7.48051948 US gallons
103.13ft3*(7.4805gallons/ft3) = 771.46 gallons
The volume of the pool is 771.46 gallons.
You need three measurements to calculate the volume. Length x Breadth x Average depth. If you measure in feet, multiply the answer x 6.25 (6 1/4 gallons to a cubic foot) Then you know how many cubic feet there.
The cost for what:
the pool, the water, the chemicals, the heat, the electricity, the maintenance etc???
Cannot be answered with only these measurements. For a rectangular pool, the length, width and depth are needed. For a round pool, the diameter and depth are needed.
Assuming that the average depth of the pool is 5 feet the width is 4 feet and the length is 18 feet, The pool would have approx. 3,000 gallons of water.
7,646 gallons.
7,646.4 gallons.
55,000 Gal.
4800
If this is a round pool 18 feet across and you fill it with 4 feet of water, it contains 7,646 gallons of water.
How many gallons of water for a 15'x30' swimming pool?
A pool of this size can hold up to about 11,970 gallons of water.
A pool this size can hold up to about 5,250 gallons of water.
This pool can hold a maximum of about 5,707.6 gallons of water.
This pool, when filled with 4.5 feet of water, will contain about 15,300 gallons of water.
600,000 gallons
48,000 gallons of water
For this size pool, about 4,862.3 gallons.
The Shamu Close up pool is 1 million gallons
Is the pool a circle? Do you want US gallons, or Imperial gallons?