pool gallons 7630.2 How do you get that (D2)x(D2)x3.14 Average depth x 7.5. In your case 18x18x3.14+4x7.5= 7630.2 .
NO! Sorry, but that lot is all wrong.
The formula for volume is wrong, and there is no addition in it either. The volume of a cylinder is pi*r^2*H (or depth here, for H), where r is the Radius.
So the volume is 3.142 x 9 x 9 x 4 =
1018.01 cubic feet (assuming 4 feet is the water depth and is constant across the pool).
Now multiply that by the number of gallons (US ones?) in 1 cu.ft. to find the water capacity.
Three feet of water in a 12-foot round pool is about 2,550 gallons.
Round Pool: Depth x Diameter-squared x 5.9 = Volume in Gallons
7,646.4 gallons are needed.
About 28,913 gallons of water.
To fill your 18-foot round pool to a depth of 48" would require about 7,646 gallons of water. If you filled it to 36", the total would decrease to about 5,735 gallons.
The volume of the pool is 2,290.2 cu ft and has a maximum capacity of 17,133.2 gallons of water.
To fill this pool to a depth of four feet you will need about 7,646 gallons of water. If you decide to fill it to three feet deep, the gallons decreases to around 5,735.
489.76 gallons of water.
About 755 gallons of water.
4,531 US gallons.
3384 gallons for every foot deep it is.
About 23,895 gallons.
About 7,650 gallons.
A round, 16' diameter 4' deep pool has a capacity of about 6,016 gallons of water.
4,047.4 US gallons of water.
13,594 US gallons of water.
5,287.7 gallons of water.
About 20,030 gallons of water.
2,549 US gallons of water.