Assuming your pool is 18 feet in diameter, then the radius of the circle is 9 feet. The formula for the surface area of the pool is then:
area = pi * r^2 = pi * (9^2) = pi * 81 = 254.469 square feet
Now you can multiply by the depth of 4 feet to get the total volume of water:
volume = area * depth = 254.469 * 4 = 1017.876 cubic feet
Use this page to convert cubic feet to gallons:
https://www.convertunits.com/from/cubic+feet/to/gallons
1017.876 cubic feet = 7614.24 gallons of water
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| 06/26/2010, 9:03 PM | calculate amount of gallons |
| 06/27/2010, 2:36 PM | Re: calculate amount of gallons |